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Finding the Fourth Proportional to 81,856.40, 122,669.40 and 60,630.80

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Solution

The fourth proportional to 81,856.40, 122,669.40 and 60,630.80 is: 90,860.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,856.40 : 122,669.40 = 60,630.80 : x
  2. Step 2: Convert to fraction form
    81,856.40/122,669.40 = 60,630.80/x
  3. Step 3: Cross multiply
    81,856.40x = 122,669.40 × 60,630.80
  4. Step 4: Simplify right side
    81,856.40x = 7,437,543,857.52
  5. Step 5: Solve for x
    x = 7,437,543,857.52/81,856.40
  6. Step 6: Final answer
    x = 90,860.87

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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.