Home / 138,621.28-191,293.06-78,191.04

Finding the Fourth Proportional to 138,621.28, 191,293.06 and 78,191.04

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Solution

The fourth proportional to 138,621.28, 191,293.06 and 78,191.04 is: 107,901.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,621.28 : 191,293.06 = 78,191.04 : x
  2. Step 2: Convert to fraction form
    138,621.28/191,293.06 = 78,191.04/x
  3. Step 3: Cross multiply
    138,621.28x = 191,293.06 × 78,191.04
  4. Step 4: Simplify right side
    138,621.28x = 14,957,403,306.18
  5. Step 5: Solve for x
    x = 14,957,403,306.18/138,621.28
  6. Step 6: Final answer
    x = 107,901.21

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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.