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Finding the Fourth Proportional to 101,992.80, 140,727.06 and 61,705.56

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Solution

The fourth proportional to 101,992.80, 140,727.06 and 61,705.56 is: 85,139.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,992.80 : 140,727.06 = 61,705.56 : x
  2. Step 2: Convert to fraction form
    101,992.80/140,727.06 = 61,705.56/x
  3. Step 3: Cross multiply
    101,992.80x = 140,727.06 × 61,705.56
  4. Step 4: Simplify right side
    101,992.80x = 8,683,642,044.45
  5. Step 5: Solve for x
    x = 8,683,642,044.45/101,992.80
  6. Step 6: Final answer
    x = 85,139.76

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.