Home / 138,534.22-191,165.70-78,119.76

Finding the Fourth Proportional to 138,534.22, 191,165.70 and 78,119.76

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Solution

The fourth proportional to 138,534.22, 191,165.70 and 78,119.76 is: 107,798.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,534.22 : 191,165.70 = 78,119.76 : x
  2. Step 2: Convert to fraction form
    138,534.22/191,165.70 = 78,119.76/x
  3. Step 3: Cross multiply
    138,534.22x = 191,165.70 × 78,119.76
  4. Step 4: Simplify right side
    138,534.22x = 14,933,819,082.15
  5. Step 5: Solve for x
    x = 14,933,819,082.15/138,534.22
  6. Step 6: Final answer
    x = 107,798.77

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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.