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Finding the Fourth Proportional to 782.46, 1,175.13 and 621.18

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Solution

The fourth proportional to 782.46, 1,175.13 and 621.18 is: 932.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.46 : 1,175.13 = 621.18 : x
  2. Step 2: Convert to fraction form
    782.46/1,175.13 = 621.18/x
  3. Step 3: Cross multiply
    782.46x = 1,175.13 × 621.18
  4. Step 4: Simplify right side
    782.46x = 729,967.25
  5. Step 5: Solve for x
    x = 729,967.25/782.46
  6. Step 6: Final answer
    x = 932.91

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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.