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Finding the Fourth Proportional to 749.60, 1,124.89 and 338.76

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Solution

The fourth proportional to 749.60, 1,124.89 and 338.76 is: 508.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.60 : 1,124.89 = 338.76 : x
  2. Step 2: Convert to fraction form
    749.60/1,124.89 = 338.76/x
  3. Step 3: Cross multiply
    749.60x = 1,124.89 × 338.76
  4. Step 4: Simplify right side
    749.60x = 381,071.40
  5. Step 5: Solve for x
    x = 381,071.40/749.60
  6. Step 6: Final answer
    x = 508.36

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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.