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Finding the Fourth Proportional to 691.12, 1,035.98 and 343.92

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Solution

The fourth proportional to 691.12, 1,035.98 and 343.92 is: 515.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.12 : 1,035.98 = 343.92 : x
  2. Step 2: Convert to fraction form
    691.12/1,035.98 = 343.92/x
  3. Step 3: Cross multiply
    691.12x = 1,035.98 × 343.92
  4. Step 4: Simplify right side
    691.12x = 356,294.24
  5. Step 5: Solve for x
    x = 356,294.24/691.12
  6. Step 6: Final answer
    x = 515.53

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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.