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Finding the Fourth Proportional to 78,716.80, 108,627.78 and 42,906.70

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Solution

The fourth proportional to 78,716.80, 108,627.78 and 42,906.70 is: 59,210.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,716.80 : 108,627.78 = 42,906.70 : x
  2. Step 2: Convert to fraction form
    78,716.80/108,627.78 = 42,906.70/x
  3. Step 3: Cross multiply
    78,716.80x = 108,627.78 × 42,906.70
  4. Step 4: Simplify right side
    78,716.80x = 4,660,859,568.13
  5. Step 5: Solve for x
    x = 4,660,859,568.13/78,716.80
  6. Step 6: Final answer
    x = 59,210.48

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.