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Finding the Fourth Proportional to 866.91, 1,298.70 and 726.42

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Solution

The fourth proportional to 866.91, 1,298.70 and 726.42 is: 1,088.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    866.91 : 1,298.70 = 726.42 : x
  2. Step 2: Convert to fraction form
    866.91/1,298.70 = 726.42/x
  3. Step 3: Cross multiply
    866.91x = 1,298.70 × 726.42
  4. Step 4: Simplify right side
    866.91x = 943,401.65
  5. Step 5: Solve for x
    x = 943,401.65/866.91
  6. Step 6: Final answer
    x = 1,088.23

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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.