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Finding the Fourth Proportional to 617,821.20, 926,731.80 and 485,110.80

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Solution

The fourth proportional to 617,821.20, 926,731.80 and 485,110.80 is: 727,666.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    617,821.20 : 926,731.80 = 485,110.80 : x
  2. Step 2: Convert to fraction form
    617,821.20/926,731.80 = 485,110.80/x
  3. Step 3: Cross multiply
    617,821.20x = 926,731.80 × 485,110.80
  4. Step 4: Simplify right side
    617,821.20x = 449,567,604,883.44
  5. Step 5: Solve for x
    x = 449,567,604,883.44/617,821.20
  6. Step 6: Final answer
    x = 727,666.20

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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.