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Finding the Fourth Proportional to 78,910.80, 118,366.20 and 66,469.20

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Solution

The fourth proportional to 78,910.80, 118,366.20 and 66,469.20 is: 99,703.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,910.80 : 118,366.20 = 66,469.20 : x
  2. Step 2: Convert to fraction form
    78,910.80/118,366.20 = 66,469.20/x
  3. Step 3: Cross multiply
    78,910.80x = 118,366.20 × 66,469.20
  4. Step 4: Simplify right side
    78,910.80x = 7,867,706,621.04
  5. Step 5: Solve for x
    x = 7,867,706,621.04/78,910.80
  6. Step 6: Final answer
    x = 99,703.80

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1.5x scale

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.