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Finding the Fourth Proportional to 78,708.80, 118,063.20 and 43,279.40

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Solution

The fourth proportional to 78,708.80, 118,063.20 and 43,279.40 is: 64,919.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,708.80 : 118,063.20 = 43,279.40 : x
  2. Step 2: Convert to fraction form
    78,708.80/118,063.20 = 43,279.40/x
  3. Step 3: Cross multiply
    78,708.80x = 118,063.20 × 43,279.40
  4. Step 4: Simplify right side
    78,708.80x = 5,109,704,458.08
  5. Step 5: Solve for x
    x = 5,109,704,458.08/78,708.80
  6. Step 6: Final answer
    x = 64,919.10

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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.