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Finding the Fourth Proportional to 749.23, 1,123.99 and 440.92

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Solution

The fourth proportional to 749.23, 1,123.99 and 440.92 is: 661.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.23 : 1,123.99 = 440.92 : x
  2. Step 2: Convert to fraction form
    749.23/1,123.99 = 440.92/x
  3. Step 3: Cross multiply
    749.23x = 1,123.99 × 440.92
  4. Step 4: Simplify right side
    749.23x = 495,589.67
  5. Step 5: Solve for x
    x = 495,589.67/749.23
  6. Step 6: Final answer
    x = 661.47

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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.