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Finding the Fourth Proportional to 864.17, 1,295.80 and 691.94

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Solution

The fourth proportional to 864.17, 1,295.80 and 691.94 is: 1,037.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    864.17 : 1,295.80 = 691.94 : x
  2. Step 2: Convert to fraction form
    864.17/1,295.80 = 691.94/x
  3. Step 3: Cross multiply
    864.17x = 1,295.80 × 691.94
  4. Step 4: Simplify right side
    864.17x = 896,617.36
  5. Step 5: Solve for x
    x = 896,617.36/864.17
  6. Step 6: Final answer
    x = 1,037.55

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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.