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Finding the Fourth Proportional to 866.30, 1,298.67 and 318.11

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Solution

The fourth proportional to 866.30, 1,298.67 and 318.11 is: 476.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    866.30 : 1,298.67 = 318.11 : x
  2. Step 2: Convert to fraction form
    866.30/1,298.67 = 318.11/x
  3. Step 3: Cross multiply
    866.30x = 1,298.67 × 318.11
  4. Step 4: Simplify right side
    866.30x = 413,119.91
  5. Step 5: Solve for x
    x = 413,119.91/866.30
  6. Step 6: Final answer
    x = 476.88

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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.