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Finding the Fourth Proportional to 920.79, 1,380.50 and 555.49

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Solution

The fourth proportional to 920.79, 1,380.50 and 555.49 is: 832.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.79 : 1,380.50 = 555.49 : x
  2. Step 2: Convert to fraction form
    920.79/1,380.50 = 555.49/x
  3. Step 3: Cross multiply
    920.79x = 1,380.50 × 555.49
  4. Step 4: Simplify right side
    920.79x = 766,856.00
  5. Step 5: Solve for x
    x = 766,856.00/920.79
  6. Step 6: Final answer
    x = 832.82

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Double scale
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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.