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Finding the Fourth Proportional to 749.67, 1,123.59 and 338.70

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Solution

The fourth proportional to 749.67, 1,123.59 and 338.70 is: 507.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.67 : 1,123.59 = 338.70 : x
  2. Step 2: Convert to fraction form
    749.67/1,123.59 = 338.70/x
  3. Step 3: Cross multiply
    749.67x = 1,123.59 × 338.70
  4. Step 4: Simplify right side
    749.67x = 380,559.93
  5. Step 5: Solve for x
    x = 380,559.93/749.67
  6. Step 6: Final answer
    x = 507.64

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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.