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Finding the Fourth Proportional to 749.39, 1,123.91 and 287.39

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Solution

The fourth proportional to 749.39, 1,123.91 and 287.39 is: 431.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.39 : 1,123.91 = 287.39 : x
  2. Step 2: Convert to fraction form
    749.39/1,123.91 = 287.39/x
  3. Step 3: Cross multiply
    749.39x = 1,123.91 × 287.39
  4. Step 4: Simplify right side
    749.39x = 323,000.49
  5. Step 5: Solve for x
    x = 323,000.49/749.39
  6. Step 6: Final answer
    x = 431.02

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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.