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Finding the Fourth Proportional to 765.90, 1,149.45 and 355.08

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Solution

The fourth proportional to 765.90, 1,149.45 and 355.08 is: 532.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.90 : 1,149.45 = 355.08 : x
  2. Step 2: Convert to fraction form
    765.90/1,149.45 = 355.08/x
  3. Step 3: Cross multiply
    765.90x = 1,149.45 × 355.08
  4. Step 4: Simplify right side
    765.90x = 408,146.71
  5. Step 5: Solve for x
    x = 408,146.71/765.90
  6. Step 6: Final answer
    x = 532.90

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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.