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Finding the Fourth Proportional to 749.32, 1,123.85 and 338.36

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Solution

The fourth proportional to 749.32, 1,123.85 and 338.36 is: 507.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.32 : 1,123.85 = 338.36 : x
  2. Step 2: Convert to fraction form
    749.32/1,123.85 = 338.36/x
  3. Step 3: Cross multiply
    749.32x = 1,123.85 × 338.36
  4. Step 4: Simplify right side
    749.32x = 380,260.79
  5. Step 5: Solve for x
    x = 380,260.79/749.32
  6. Step 6: Final answer
    x = 507.48

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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.