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Finding the Fourth Proportional to 806.72, 1,115.52 and 691.52

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Solution

The fourth proportional to 806.72, 1,115.52 and 691.52 is: 956.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    806.72 : 1,115.52 = 691.52 : x
  2. Step 2: Convert to fraction form
    806.72/1,115.52 = 691.52/x
  3. Step 3: Cross multiply
    806.72x = 1,115.52 × 691.52
  4. Step 4: Simplify right side
    806.72x = 771,404.39
  5. Step 5: Solve for x
    x = 771,404.39/806.72
  6. Step 6: Final answer
    x = 956.22

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.