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Finding the Fourth Proportional to 85,493.61, 128,242.61 and 40,504.43

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Solution

The fourth proportional to 85,493.61, 128,242.61 and 40,504.43 is: 60,757.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,493.61 : 128,242.61 = 40,504.43 : x
  2. Step 2: Convert to fraction form
    85,493.61/128,242.61 = 40,504.43/x
  3. Step 3: Cross multiply
    85,493.61x = 128,242.61 × 40,504.43
  4. Step 4: Simplify right side
    85,493.61x = 5,194,393,937.85
  5. Step 5: Solve for x
    x = 5,194,393,937.85/85,493.61
  6. Step 6: Final answer
    x = 60,757.69

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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.