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Finding the Fourth Proportional to 85,687.40, 128,531.10 and 60,755.60

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Solution

The fourth proportional to 85,687.40, 128,531.10 and 60,755.60 is: 91,133.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,687.40 : 128,531.10 = 60,755.60 : x
  2. Step 2: Convert to fraction form
    85,687.40/128,531.10 = 60,755.60/x
  3. Step 3: Cross multiply
    85,687.40x = 128,531.10 × 60,755.60
  4. Step 4: Simplify right side
    85,687.40x = 7,808,984,099.16
  5. Step 5: Solve for x
    x = 7,808,984,099.16/85,687.40
  6. Step 6: Final answer
    x = 91,133.40

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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.