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Finding the Fourth Proportional to 618,748.20, 928,122.30 and 478,780.20

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Solution

The fourth proportional to 618,748.20, 928,122.30 and 478,780.20 is: 718,170.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    618,748.20 : 928,122.30 = 478,780.20 : x
  2. Step 2: Convert to fraction form
    618,748.20/928,122.30 = 478,780.20/x
  3. Step 3: Cross multiply
    618,748.20x = 928,122.30 × 478,780.20
  4. Step 4: Simplify right side
    618,748.20x = 444,366,580,418.46
  5. Step 5: Solve for x
    x = 444,366,580,418.46/618,748.20
  6. Step 6: Final answer
    x = 718,170.30

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.