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Finding the Fourth Proportional to 78,915.60, 118,200.60 and 77,187.60

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Solution

The fourth proportional to 78,915.60, 118,200.60 and 77,187.60 is: 115,612.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,915.60 : 118,200.60 = 77,187.60 : x
  2. Step 2: Convert to fraction form
    78,915.60/118,200.60 = 77,187.60/x
  3. Step 3: Cross multiply
    78,915.60x = 118,200.60 × 77,187.60
  4. Step 4: Simplify right side
    78,915.60x = 9,123,620,632.56
  5. Step 5: Solve for x
    x = 9,123,620,632.56/78,915.60
  6. Step 6: Final answer
    x = 115,612.38

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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.