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Finding the Fourth Proportional to 765.92, 1,149.16 and 355.36

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Solution

The fourth proportional to 765.92, 1,149.16 and 355.36 is: 533.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.92 : 1,149.16 = 355.36 : x
  2. Step 2: Convert to fraction form
    765.92/1,149.16 = 355.36/x
  3. Step 3: Cross multiply
    765.92x = 1,149.16 × 355.36
  4. Step 4: Simplify right side
    765.92x = 408,365.50
  5. Step 5: Solve for x
    x = 408,365.50/765.92
  6. Step 6: Final answer
    x = 533.17

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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.