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Finding the Fourth Proportional to 78,643.20, 118,195.20 and 68,505.60

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Solution

The fourth proportional to 78,643.20, 118,195.20 and 68,505.60 is: 102,959.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,643.20 : 118,195.20 = 68,505.60 : x
  2. Step 2: Convert to fraction form
    78,643.20/118,195.20 = 68,505.60/x
  3. Step 3: Cross multiply
    78,643.20x = 118,195.20 × 68,505.60
  4. Step 4: Simplify right side
    78,643.20x = 8,097,033,093.12
  5. Step 5: Solve for x
    x = 8,097,033,093.12/78,643.20
  6. Step 6: Final answer
    x = 102,959.10

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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.