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Finding the Fourth Proportional to 78,979.80, 118,296.90 and 47,760.60

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Solution

The fourth proportional to 78,979.80, 118,296.90 and 47,760.60 is: 71,536.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,979.80 : 118,296.90 = 47,760.60 : x
  2. Step 2: Convert to fraction form
    78,979.80/118,296.90 = 47,760.60/x
  3. Step 3: Cross multiply
    78,979.80x = 118,296.90 × 47,760.60
  4. Step 4: Simplify right side
    78,979.80x = 5,649,930,922.14
  5. Step 5: Solve for x
    x = 5,649,930,922.14/78,979.80
  6. Step 6: Final answer
    x = 71,536.40

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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.