Home / 138,839.23-191,587.30-78,415.93

Finding the Fourth Proportional to 138,839.23, 191,587.30 and 78,415.93

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Solution

The fourth proportional to 138,839.23, 191,587.30 and 78,415.93 is: 108,207.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,839.23 : 191,587.30 = 78,415.93 : x
  2. Step 2: Convert to fraction form
    138,839.23/191,587.30 = 78,415.93/x
  3. Step 3: Cross multiply
    138,839.23x = 191,587.30 × 78,415.93
  4. Step 4: Simplify right side
    138,839.23x = 15,023,496,305.69
  5. Step 5: Solve for x
    x = 15,023,496,305.69/138,839.23
  6. Step 6: Final answer
    x = 108,207.86

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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.