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Finding the Fourth Proportional to 691.34, 1,035.80 and 576.52

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Solution

The fourth proportional to 691.34, 1,035.80 and 576.52 is: 863.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.34 : 1,035.80 = 576.52 : x
  2. Step 2: Convert to fraction form
    691.34/1,035.80 = 576.52/x
  3. Step 3: Cross multiply
    691.34x = 1,035.80 × 576.52
  4. Step 4: Simplify right side
    691.34x = 597,159.42
  5. Step 5: Solve for x
    x = 597,159.42/691.34
  6. Step 6: Final answer
    x = 863.77

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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.