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Finding the Fourth Proportional to 84,118.79, 125,926.09 and 81,127.97

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Solution

The fourth proportional to 84,118.79, 125,926.09 and 81,127.97 is: 121,448.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,118.79 : 125,926.09 = 81,127.97 : x
  2. Step 2: Convert to fraction form
    84,118.79/125,926.09 = 81,127.97/x
  3. Step 3: Cross multiply
    84,118.79x = 125,926.09 × 81,127.97
  4. Step 4: Simplify right side
    84,118.79x = 10,216,128,051.74
  5. Step 5: Solve for x
    x = 10,216,128,051.74/84,118.79
  6. Step 6: Final answer
    x = 121,448.82

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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.