Home / 138,725.17-191,439.73-78,295.28

Finding the Fourth Proportional to 138,725.17, 191,439.73 and 78,295.28

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Solution

The fourth proportional to 138,725.17, 191,439.73 and 78,295.28 is: 108,046.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,725.17 : 191,439.73 = 78,295.28 : x
  2. Step 2: Convert to fraction form
    138,725.17/191,439.73 = 78,295.28/x
  3. Step 3: Cross multiply
    138,725.17x = 191,439.73 × 78,295.28
  4. Step 4: Simplify right side
    138,725.17x = 14,988,827,799.21
  5. Step 5: Solve for x
    x = 14,988,827,799.21/138,725.17
  6. Step 6: Final answer
    x = 108,046.92

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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.