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Finding the Fourth Proportional to 61,129.61, 84,281.34 and 43,687.78

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Solution

The fourth proportional to 61,129.61, 84,281.34 and 43,687.78 is: 60,233.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,129.61 : 84,281.34 = 43,687.78 : x
  2. Step 2: Convert to fraction form
    61,129.61/84,281.34 = 43,687.78/x
  3. Step 3: Cross multiply
    61,129.61x = 84,281.34 × 43,687.78
  4. Step 4: Simplify right side
    61,129.61x = 3,682,064,000.18
  5. Step 5: Solve for x
    x = 3,682,064,000.18/61,129.61
  6. Step 6: Final answer
    x = 60,233.73

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.