Home / 138,910.86-191,685.60-78,486.75

Finding the Fourth Proportional to 138,910.86, 191,685.60 and 78,486.75

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Solution

The fourth proportional to 138,910.86, 191,685.60 and 78,486.75 is: 108,305.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,910.86 : 191,685.60 = 78,486.75 : x
  2. Step 2: Convert to fraction form
    138,910.86/191,685.60 = 78,486.75/x
  3. Step 3: Cross multiply
    138,910.86x = 191,685.60 × 78,486.75
  4. Step 4: Simplify right side
    138,910.86x = 15,044,779,765.80
  5. Step 5: Solve for x
    x = 15,044,779,765.80/138,910.86
  6. Step 6: Final answer
    x = 108,305.28

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1.5x scale

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.