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Finding the Fourth Proportional to 81,293.40, 121,721.40 and 63,651.60

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Solution

The fourth proportional to 81,293.40, 121,721.40 and 63,651.60 is: 95,306.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,293.40 : 121,721.40 = 63,651.60 : x
  2. Step 2: Convert to fraction form
    81,293.40/121,721.40 = 63,651.60/x
  3. Step 3: Cross multiply
    81,293.40x = 121,721.40 × 63,651.60
  4. Step 4: Simplify right side
    81,293.40x = 7,747,761,864.24
  5. Step 5: Solve for x
    x = 7,747,761,864.24/81,293.40
  6. Step 6: Final answer
    x = 95,306.16

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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.