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Finding the Fourth Proportional to 765.11, 1,147.14 and 457.17

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Solution

The fourth proportional to 765.11, 1,147.14 and 457.17 is: 685.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.11 : 1,147.14 = 457.17 : x
  2. Step 2: Convert to fraction form
    765.11/1,147.14 = 457.17/x
  3. Step 3: Cross multiply
    765.11x = 1,147.14 × 457.17
  4. Step 4: Simplify right side
    765.11x = 524,442.00
  5. Step 5: Solve for x
    x = 524,442.00/765.11
  6. Step 6: Final answer
    x = 685.45

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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.