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Finding the Fourth Proportional to 81,127.52, 121,526.03 and 66,187.88

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Solution

The fourth proportional to 81,127.52, 121,526.03 and 66,187.88 is: 99,147.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,127.52 : 121,526.03 = 66,187.88 : x
  2. Step 2: Convert to fraction form
    81,127.52/121,526.03 = 66,187.88/x
  3. Step 3: Cross multiply
    81,127.52x = 121,526.03 × 66,187.88
  4. Step 4: Simplify right side
    81,127.52x = 8,043,549,848.36
  5. Step 5: Solve for x
    x = 8,043,549,848.36/81,127.52
  6. Step 6: Final answer
    x = 99,147.00

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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.