Home / 138,579.54-191,237.10-78,149.10

Finding the Fourth Proportional to 138,579.54, 191,237.10 and 78,149.10

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Solution

The fourth proportional to 138,579.54, 191,237.10 and 78,149.10 is: 107,844.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,579.54 : 191,237.10 = 78,149.10 : x
  2. Step 2: Convert to fraction form
    138,579.54/191,237.10 = 78,149.10/x
  3. Step 3: Cross multiply
    138,579.54x = 191,237.10 × 78,149.10
  4. Step 4: Simplify right side
    138,579.54x = 14,945,007,251.61
  5. Step 5: Solve for x
    x = 14,945,007,251.61/138,579.54
  6. Step 6: Final answer
    x = 107,844.26

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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.