Home / 138,729.40-191,447.24-78,302.60

Finding the Fourth Proportional to 138,729.40, 191,447.24 and 78,302.60

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Solution

The fourth proportional to 138,729.40, 191,447.24 and 78,302.60 is: 108,057.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,729.40 : 191,447.24 = 78,302.60 : x
  2. Step 2: Convert to fraction form
    138,729.40/191,447.24 = 78,302.60/x
  3. Step 3: Cross multiply
    138,729.40x = 191,447.24 × 78,302.60
  4. Step 4: Simplify right side
    138,729.40x = 14,990,816,654.82
  5. Step 5: Solve for x
    x = 14,990,816,654.82/138,729.40
  6. Step 6: Final answer
    x = 108,057.97

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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.