Home / 78,821.10-118,231.65-68,979.60

Finding the Fourth Proportional to 78,821.10, 118,231.65 and 68,979.60

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Solution

The fourth proportional to 78,821.10, 118,231.65 and 68,979.60 is: 103,469.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,821.10 : 118,231.65 = 68,979.60 : x
  2. Step 2: Convert to fraction form
    78,821.10/118,231.65 = 68,979.60/x
  3. Step 3: Cross multiply
    78,821.10x = 118,231.65 × 68,979.60
  4. Step 4: Simplify right side
    78,821.10x = 8,155,571,924.34
  5. Step 5: Solve for x
    x = 8,155,571,924.34/78,821.10
  6. Step 6: Final answer
    x = 103,469.40

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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.