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Finding the Fourth Proportional to 81,246.80, 121,870.20 and 72,693.20

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Solution

The fourth proportional to 81,246.80, 121,870.20 and 72,693.20 is: 109,039.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,246.80 : 121,870.20 = 72,693.20 : x
  2. Step 2: Convert to fraction form
    81,246.80/121,870.20 = 72,693.20/x
  3. Step 3: Cross multiply
    81,246.80x = 121,870.20 × 72,693.20
  4. Step 4: Simplify right side
    81,246.80x = 8,859,134,822.64
  5. Step 5: Solve for x
    x = 8,859,134,822.64/81,246.80
  6. Step 6: Final answer
    x = 109,039.80

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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.