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Finding the Fourth Proportional to 81,355.49, 122,119.49 and 72,055.88

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Solution

The fourth proportional to 81,355.49, 122,119.49 and 72,055.88 is: 108,160.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,355.49 : 122,119.49 = 72,055.88 : x
  2. Step 2: Convert to fraction form
    81,355.49/122,119.49 = 72,055.88/x
  3. Step 3: Cross multiply
    81,355.49x = 122,119.49 × 72,055.88
  4. Step 4: Simplify right side
    81,355.49x = 8,799,426,886.64
  5. Step 5: Solve for x
    x = 8,799,426,886.64/81,355.49
  6. Step 6: Final answer
    x = 108,160.22

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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.