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Finding the Fourth Proportional to 78,820.60, 118,230.90 and 68,979.10

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Solution

The fourth proportional to 78,820.60, 118,230.90 and 68,979.10 is: 103,468.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,820.60 : 118,230.90 = 68,979.10 : x
  2. Step 2: Convert to fraction form
    78,820.60/118,230.90 = 68,979.10/x
  3. Step 3: Cross multiply
    78,820.60x = 118,230.90 × 68,979.10
  4. Step 4: Simplify right side
    78,820.60x = 8,155,461,074.19
  5. Step 5: Solve for x
    x = 8,155,461,074.19/78,820.60
  6. Step 6: Final answer
    x = 103,468.65

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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.