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Finding the Fourth Proportional to 138,598.92, 191,266.25 and 78,169.38

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Solution

The fourth proportional to 138,598.92, 191,266.25 and 78,169.38 is: 107,873.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,598.92 : 191,266.25 = 78,169.38 : x
  2. Step 2: Convert to fraction form
    138,598.92/191,266.25 = 78,169.38/x
  3. Step 3: Cross multiply
    138,598.92x = 191,266.25 × 78,169.38
  4. Step 4: Simplify right side
    138,598.92x = 14,951,163,069.33
  5. Step 5: Solve for x
    x = 14,951,163,069.33/138,598.92
  6. Step 6: Final answer
    x = 107,873.59

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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.