Home / 138,941.89-191,738.01-78,508.60

Finding the Fourth Proportional to 138,941.89, 191,738.01 and 78,508.60

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Solution

The fourth proportional to 138,941.89, 191,738.01 and 78,508.60 is: 108,340.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,941.89 : 191,738.01 = 78,508.60 : x
  2. Step 2: Convert to fraction form
    138,941.89/191,738.01 = 78,508.60/x
  3. Step 3: Cross multiply
    138,941.89x = 191,738.01 × 78,508.60
  4. Step 4: Simplify right side
    138,941.89x = 15,053,082,731.89
  5. Step 5: Solve for x
    x = 15,053,082,731.89/138,941.89
  6. Step 6: Final answer
    x = 108,340.85

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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.