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Finding the Fourth Proportional to 499.72, 747.75 and 439.58

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Solution

The fourth proportional to 499.72, 747.75 and 439.58 is: 657.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    499.72 : 747.75 = 439.58 : x
  2. Step 2: Convert to fraction form
    499.72/747.75 = 439.58/x
  3. Step 3: Cross multiply
    499.72x = 747.75 × 439.58
  4. Step 4: Simplify right side
    499.72x = 328,692.78
  5. Step 5: Solve for x
    x = 328,692.78/499.72
  6. Step 6: Final answer
    x = 657.75

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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.