Home / 138,747.20-191,479.75-78,295.78

Finding the Fourth Proportional to 138,747.20, 191,479.75 and 78,295.78

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Solution

The fourth proportional to 138,747.20, 191,479.75 and 78,295.78 is: 108,053.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,747.20 : 191,479.75 = 78,295.78 : x
  2. Step 2: Convert to fraction form
    138,747.20/191,479.75 = 78,295.78/x
  3. Step 3: Cross multiply
    138,747.20x = 191,479.75 × 78,295.78
  4. Step 4: Simplify right side
    138,747.20x = 14,992,056,424.07
  5. Step 5: Solve for x
    x = 14,992,056,424.07/138,747.20
  6. Step 6: Final answer
    x = 108,053.04

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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.