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Finding the Fourth Proportional to 138,725.90, 191,448.52 and 85,013.90

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Solution

The fourth proportional to 138,725.90, 191,448.52 and 85,013.90 is: 117,323.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,725.90 : 191,448.52 = 85,013.90 : x
  2. Step 2: Convert to fraction form
    138,725.90/191,448.52 = 85,013.90/x
  3. Step 3: Cross multiply
    138,725.90x = 191,448.52 × 85,013.90
  4. Step 4: Simplify right side
    138,725.90x = 16,275,785,334.43
  5. Step 5: Solve for x
    x = 16,275,785,334.43/138,725.90
  6. Step 6: Final answer
    x = 117,323.34

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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.