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Finding the Fourth Proportional to 691.47, 1,036.85 and 229.20

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Solution

The fourth proportional to 691.47, 1,036.85 and 229.20 is: 343.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.47 : 1,036.85 = 229.20 : x
  2. Step 2: Convert to fraction form
    691.47/1,036.85 = 229.20/x
  3. Step 3: Cross multiply
    691.47x = 1,036.85 × 229.20
  4. Step 4: Simplify right side
    691.47x = 237,651.02
  5. Step 5: Solve for x
    x = 237,651.02/691.47
  6. Step 6: Final answer
    x = 343.69

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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.