Home / 81,412.40-121,972.80-72,081.20

Finding the Fourth Proportional to 81,412.40, 121,972.80 and 72,081.20

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Solution

The fourth proportional to 81,412.40, 121,972.80 and 72,081.20 is: 107,992.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,412.40 : 121,972.80 = 72,081.20 : x
  2. Step 2: Convert to fraction form
    81,412.40/121,972.80 = 72,081.20/x
  3. Step 3: Cross multiply
    81,412.40x = 121,972.80 × 72,081.20
  4. Step 4: Simplify right side
    81,412.40x = 8,791,945,791.36
  5. Step 5: Solve for x
    x = 8,791,945,791.36/81,412.40
  6. Step 6: Final answer
    x = 107,992.71

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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.