Home / 138,956.20-191,758.74-78,546.40

Finding the Fourth Proportional to 138,956.20, 191,758.74 and 78,546.40

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Solution

The fourth proportional to 138,956.20, 191,758.74 and 78,546.40 is: 108,393.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,956.20 : 191,758.74 = 78,546.40 : x
  2. Step 2: Convert to fraction form
    138,956.20/191,758.74 = 78,546.40/x
  3. Step 3: Cross multiply
    138,956.20x = 191,758.74 × 78,546.40
  4. Step 4: Simplify right side
    138,956.20x = 15,061,958,695.54
  5. Step 5: Solve for x
    x = 15,061,958,695.54/138,956.20
  6. Step 6: Final answer
    x = 108,393.57

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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.