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Finding the Fourth Proportional to 782.52, 1,172.15 and 457.71

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Solution

The fourth proportional to 782.52, 1,172.15 and 457.71 is: 685.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.52 : 1,172.15 = 457.71 : x
  2. Step 2: Convert to fraction form
    782.52/1,172.15 = 457.71/x
  3. Step 3: Cross multiply
    782.52x = 1,172.15 × 457.71
  4. Step 4: Simplify right side
    782.52x = 536,504.78
  5. Step 5: Solve for x
    x = 536,504.78/782.52
  6. Step 6: Final answer
    x = 685.61

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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.