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Finding the Fourth Proportional to 85,494.61, 128,244.11 and 40,505.43

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Solution

The fourth proportional to 85,494.61, 128,244.11 and 40,505.43 is: 60,759.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,494.61 : 128,244.11 = 40,505.43 : x
  2. Step 2: Convert to fraction form
    85,494.61/128,244.11 = 40,505.43/x
  3. Step 3: Cross multiply
    85,494.61x = 128,244.11 × 40,505.43
  4. Step 4: Simplify right side
    85,494.61x = 5,194,582,820.52
  5. Step 5: Solve for x
    x = 5,194,582,820.52/85,494.61
  6. Step 6: Final answer
    x = 60,759.18

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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.