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Finding the Fourth Proportional to 78,821.60, 118,232.40 and 68,980.10

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Solution

The fourth proportional to 78,821.60, 118,232.40 and 68,980.10 is: 103,470.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,821.60 : 118,232.40 = 68,980.10 : x
  2. Step 2: Convert to fraction form
    78,821.60/118,232.40 = 68,980.10/x
  3. Step 3: Cross multiply
    78,821.60x = 118,232.40 × 68,980.10
  4. Step 4: Simplify right side
    78,821.60x = 8,155,682,775.24
  5. Step 5: Solve for x
    x = 8,155,682,775.24/78,821.60
  6. Step 6: Final answer
    x = 103,470.15

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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.