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Finding the Fourth Proportional to 765.14, 1,148.09 and 353.81

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Solution

The fourth proportional to 765.14, 1,148.09 and 353.81 is: 530.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.14 : 1,148.09 = 353.81 : x
  2. Step 2: Convert to fraction form
    765.14/1,148.09 = 353.81/x
  3. Step 3: Cross multiply
    765.14x = 1,148.09 × 353.81
  4. Step 4: Simplify right side
    765.14x = 406,198.21
  5. Step 5: Solve for x
    x = 406,198.21/765.14
  6. Step 6: Final answer
    x = 530.88

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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.