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Finding the Fourth Proportional to 499.06, 749.40 and 438.70

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Solution

The fourth proportional to 499.06, 749.40 and 438.70 is: 658.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    499.06 : 749.40 = 438.70 : x
  2. Step 2: Convert to fraction form
    499.06/749.40 = 438.70/x
  3. Step 3: Cross multiply
    499.06x = 749.40 × 438.70
  4. Step 4: Simplify right side
    499.06x = 328,761.78
  5. Step 5: Solve for x
    x = 328,761.78/499.06
  6. Step 6: Final answer
    x = 658.76

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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.