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Finding the Fourth Proportional to 138,524.75, 191,164.20 and 78,908.75

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Solution

The fourth proportional to 138,524.75, 191,164.20 and 78,908.75 is: 108,894.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,524.75 : 191,164.20 = 78,908.75 : x
  2. Step 2: Convert to fraction form
    138,524.75/191,164.20 = 78,908.75/x
  3. Step 3: Cross multiply
    138,524.75x = 191,164.20 × 78,908.75
  4. Step 4: Simplify right side
    138,524.75x = 15,084,528,066.75
  5. Step 5: Solve for x
    x = 15,084,528,066.75/138,524.75
  6. Step 6: Final answer
    x = 108,894.10

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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.