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Finding the Fourth Proportional to 80,469.25, 120,703.87 and 42,915.55

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Solution

The fourth proportional to 80,469.25, 120,703.87 and 42,915.55 is: 64,373.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,469.25 : 120,703.87 = 42,915.55 : x
  2. Step 2: Convert to fraction form
    80,469.25/120,703.87 = 42,915.55/x
  3. Step 3: Cross multiply
    80,469.25x = 120,703.87 × 42,915.55
  4. Step 4: Simplify right side
    80,469.25x = 5,180,072,559.13
  5. Step 5: Solve for x
    x = 5,180,072,559.13/80,469.25
  6. Step 6: Final answer
    x = 64,373.32

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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.