Home / 138,750.20-191,483.89-78,298.78

Finding the Fourth Proportional to 138,750.20, 191,483.89 and 78,298.78

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Solution

The fourth proportional to 138,750.20, 191,483.89 and 78,298.78 is: 108,057.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,750.20 : 191,483.89 = 78,298.78 : x
  2. Step 2: Convert to fraction form
    138,750.20/191,483.89 = 78,298.78/x
  3. Step 3: Cross multiply
    138,750.20x = 191,483.89 × 78,298.78
  4. Step 4: Simplify right side
    138,750.20x = 14,992,954,976.65
  5. Step 5: Solve for x
    x = 14,992,954,976.65/138,750.20
  6. Step 6: Final answer
    x = 108,057.18

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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.