Home / 138,666.35-191,343.09-78,233.46

Finding the Fourth Proportional to 138,666.35, 191,343.09 and 78,233.46

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Solution

The fourth proportional to 138,666.35, 191,343.09 and 78,233.46 is: 107,952.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,666.35 : 191,343.09 = 78,233.46 : x
  2. Step 2: Convert to fraction form
    138,666.35/191,343.09 = 78,233.46/x
  3. Step 3: Cross multiply
    138,666.35x = 191,343.09 × 78,233.46
  4. Step 4: Simplify right side
    138,666.35x = 14,969,431,977.79
  5. Step 5: Solve for x
    x = 14,969,431,977.79/138,666.35
  6. Step 6: Final answer
    x = 107,952.88

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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.