Home / 138,722.85-191,438.18-78,296.04

Finding the Fourth Proportional to 138,722.85, 191,438.18 and 78,296.04

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Solution

The fourth proportional to 138,722.85, 191,438.18 and 78,296.04 is: 108,048.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,722.85 : 191,438.18 = 78,296.04 : x
  2. Step 2: Convert to fraction form
    138,722.85/191,438.18 = 78,296.04/x
  3. Step 3: Cross multiply
    138,722.85x = 191,438.18 × 78,296.04
  4. Step 4: Simplify right side
    138,722.85x = 14,988,851,007.33
  5. Step 5: Solve for x
    x = 14,988,851,007.33/138,722.85
  6. Step 6: Final answer
    x = 108,048.90

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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.