Home / 138,690.23-191,397.94-81,321.57

Finding the Fourth Proportional to 138,690.23, 191,397.94 and 81,321.57

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Solution

The fourth proportional to 138,690.23, 191,397.94 and 81,321.57 is: 112,226.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,690.23 : 191,397.94 = 81,321.57 : x
  2. Step 2: Convert to fraction form
    138,690.23/191,397.94 = 81,321.57/x
  3. Step 3: Cross multiply
    138,690.23x = 191,397.94 × 81,321.57
  4. Step 4: Simplify right side
    138,690.23x = 15,564,780,772.26
  5. Step 5: Solve for x
    x = 15,564,780,772.26/138,690.23
  6. Step 6: Final answer
    x = 112,226.95

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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.