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Finding the Fourth Proportional to 81,258.80, 121,888.20 and 72,705.20

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Solution

The fourth proportional to 81,258.80, 121,888.20 and 72,705.20 is: 109,057.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,258.80 : 121,888.20 = 72,705.20 : x
  2. Step 2: Convert to fraction form
    81,258.80/121,888.20 = 72,705.20/x
  3. Step 3: Cross multiply
    81,258.80x = 121,888.20 × 72,705.20
  4. Step 4: Simplify right side
    81,258.80x = 8,861,905,958.64
  5. Step 5: Solve for x
    x = 8,861,905,958.64/81,258.80
  6. Step 6: Final answer
    x = 109,057.80

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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.