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Finding the Fourth Proportional to 98,670.80, 147,833.40 and 81,045.20

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Solution

The fourth proportional to 98,670.80, 147,833.40 and 81,045.20 is: 121,425.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,670.80 : 147,833.40 = 81,045.20 : x
  2. Step 2: Convert to fraction form
    98,670.80/147,833.40 = 81,045.20/x
  3. Step 3: Cross multiply
    98,670.80x = 147,833.40 × 81,045.20
  4. Step 4: Simplify right side
    98,670.80x = 11,981,187,469.68
  5. Step 5: Solve for x
    x = 11,981,187,469.68/98,670.80
  6. Step 6: Final answer
    x = 121,425.87

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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.