Home / 78,721.20-118,081.80-75,659.40

Finding the Fourth Proportional to 78,721.20, 118,081.80 and 75,659.40

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Solution

The fourth proportional to 78,721.20, 118,081.80 and 75,659.40 is: 113,489.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,721.20 : 118,081.80 = 75,659.40 : x
  2. Step 2: Convert to fraction form
    78,721.20/118,081.80 = 75,659.40/x
  3. Step 3: Cross multiply
    78,721.20x = 118,081.80 × 75,659.40
  4. Step 4: Simplify right side
    78,721.20x = 8,933,998,138.92
  5. Step 5: Solve for x
    x = 8,933,998,138.92/78,721.20
  6. Step 6: Final answer
    x = 113,489.10

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.