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Finding the Fourth Proportional to 85,542.40, 128,119.20 and 54,049.60

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Solution

The fourth proportional to 85,542.40, 128,119.20 and 54,049.60 is: 80,951.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,542.40 : 128,119.20 = 54,049.60 : x
  2. Step 2: Convert to fraction form
    85,542.40/128,119.20 = 54,049.60/x
  3. Step 3: Cross multiply
    85,542.40x = 128,119.20 × 54,049.60
  4. Step 4: Simplify right side
    85,542.40x = 6,924,791,512.32
  5. Step 5: Solve for x
    x = 6,924,791,512.32/85,542.40
  6. Step 6: Final answer
    x = 80,951.57

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1.5x scale

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.