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Finding the Fourth Proportional to 749.64, 1,123.59 and 397.71

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Solution

The fourth proportional to 749.64, 1,123.59 and 397.71 is: 596.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.64 : 1,123.59 = 397.71 : x
  2. Step 2: Convert to fraction form
    749.64/1,123.59 = 397.71/x
  3. Step 3: Cross multiply
    749.64x = 1,123.59 × 397.71
  4. Step 4: Simplify right side
    749.64x = 446,862.98
  5. Step 5: Solve for x
    x = 446,862.98/749.64
  6. Step 6: Final answer
    x = 596.10

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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.