Home / 138,619.11-191,294.15-78,189.57

Finding the Fourth Proportional to 138,619.11, 191,294.15 and 78,189.57

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Solution

The fourth proportional to 138,619.11, 191,294.15 and 78,189.57 is: 107,901.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,619.11 : 191,294.15 = 78,189.57 : x
  2. Step 2: Convert to fraction form
    138,619.11/191,294.15 = 78,189.57/x
  3. Step 3: Cross multiply
    138,619.11x = 191,294.15 × 78,189.57
  4. Step 4: Simplify right side
    138,619.11x = 14,957,206,941.07
  5. Step 5: Solve for x
    x = 14,957,206,941.07/138,619.11
  6. Step 6: Final answer
    x = 107,901.48

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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.