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Finding the Fourth Proportional to 85,517.40, 128,081.70 and 43,915.80

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Solution

The fourth proportional to 85,517.40, 128,081.70 and 43,915.80 is: 65,773.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,517.40 : 128,081.70 = 43,915.80 : x
  2. Step 2: Convert to fraction form
    85,517.40/128,081.70 = 43,915.80/x
  3. Step 3: Cross multiply
    85,517.40x = 128,081.70 × 43,915.80
  4. Step 4: Simplify right side
    85,517.40x = 5,624,810,320.86
  5. Step 5: Solve for x
    x = 5,624,810,320.86/85,517.40
  6. Step 6: Final answer
    x = 65,773.87

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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.