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Finding the Fourth Proportional to 765, 1,147.68 and 332.16

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Solution

The fourth proportional to 765, 1,147.68 and 332.16 is: 498.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    765 : 1,147.68 = 332.16 : x
  2. Step 2: Convert to fraction form
    765/1,147.68 = 332.16/x
  3. Step 3: Cross multiply
    765x = 1,147.68 × 332.16
  4. Step 4: Simplify right side
    765x = 381,213.39
  5. Step 5: Solve for x
    x = 381,213.39/765
  6. Step 6: Final answer
    x = 498.32

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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.