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Finding the Fourth Proportional to 81,244.80, 121,867.20 and 61,561.80

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Solution

The fourth proportional to 81,244.80, 121,867.20 and 61,561.80 is: 92,342.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,244.80 : 121,867.20 = 61,561.80 : x
  2. Step 2: Convert to fraction form
    81,244.80/121,867.20 = 61,561.80/x
  3. Step 3: Cross multiply
    81,244.80x = 121,867.20 × 61,561.80
  4. Step 4: Simplify right side
    81,244.80x = 7,502,364,192.96
  5. Step 5: Solve for x
    x = 7,502,364,192.96/81,244.80
  6. Step 6: Final answer
    x = 92,342.70

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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.