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Finding the Fourth Proportional to 814.56, 1,123.08 and 666.86

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Solution

The fourth proportional to 814.56, 1,123.08 and 666.86 is: 919.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    814.56 : 1,123.08 = 666.86 : x
  2. Step 2: Convert to fraction form
    814.56/1,123.08 = 666.86/x
  3. Step 3: Cross multiply
    814.56x = 1,123.08 × 666.86
  4. Step 4: Simplify right side
    814.56x = 748,937.13
  5. Step 5: Solve for x
    x = 748,937.13/814.56
  6. Step 6: Final answer
    x = 919.44

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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.