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Finding the Fourth Proportional to 765.11, 1,148.58 and 457.11

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Solution

The fourth proportional to 765.11, 1,148.58 and 457.11 is: 686.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.11 : 1,148.58 = 457.11 : x
  2. Step 2: Convert to fraction form
    765.11/1,148.58 = 457.11/x
  3. Step 3: Cross multiply
    765.11x = 1,148.58 × 457.11
  4. Step 4: Simplify right side
    765.11x = 525,027.40
  5. Step 5: Solve for x
    x = 525,027.40/765.11
  6. Step 6: Final answer
    x = 686.21

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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.