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Finding the Fourth Proportional to 782.92, 1,080.15 and 503.31

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Solution

The fourth proportional to 782.92, 1,080.15 and 503.31 is: 694.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.92 : 1,080.15 = 503.31 : x
  2. Step 2: Convert to fraction form
    782.92/1,080.15 = 503.31/x
  3. Step 3: Cross multiply
    782.92x = 1,080.15 × 503.31
  4. Step 4: Simplify right side
    782.92x = 543,650.30
  5. Step 5: Solve for x
    x = 543,650.30/782.92
  6. Step 6: Final answer
    x = 694.39

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.