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Finding the Fourth Proportional to 85,540.40, 128,116.20 and 54,047.60

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Solution

The fourth proportional to 85,540.40, 128,116.20 and 54,047.60 is: 80,948.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,540.40 : 128,116.20 = 54,047.60 : x
  2. Step 2: Convert to fraction form
    85,540.40/128,116.20 = 54,047.60/x
  3. Step 3: Cross multiply
    85,540.40x = 128,116.20 × 54,047.60
  4. Step 4: Simplify right side
    85,540.40x = 6,924,373,131.12
  5. Step 5: Solve for x
    x = 6,924,373,131.12/85,540.40
  6. Step 6: Final answer
    x = 80,948.57

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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.