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Finding the Fourth Proportional to 81,122.40, 121,568.40 and 59,896.80

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Solution

The fourth proportional to 81,122.40, 121,568.40 and 59,896.80 is: 89,760.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,122.40 : 121,568.40 = 59,896.80 : x
  2. Step 2: Convert to fraction form
    81,122.40/121,568.40 = 59,896.80/x
  3. Step 3: Cross multiply
    81,122.40x = 121,568.40 × 59,896.80
  4. Step 4: Simplify right side
    81,122.40x = 7,281,558,141.12
  5. Step 5: Solve for x
    x = 7,281,558,141.12/81,122.40
  6. Step 6: Final answer
    x = 89,760.14

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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.