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Finding the Fourth Proportional to 78,981.80, 108,994.60 and 43,171.78

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Solution

The fourth proportional to 78,981.80, 108,994.60 and 43,171.78 is: 59,576.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,981.80 : 108,994.60 = 43,171.78 : x
  2. Step 2: Convert to fraction form
    78,981.80/108,994.60 = 43,171.78/x
  3. Step 3: Cross multiply
    78,981.80x = 108,994.60 × 43,171.78
  4. Step 4: Simplify right side
    78,981.80x = 4,705,490,892.39
  5. Step 5: Solve for x
    x = 4,705,490,892.39/78,981.80
  6. Step 6: Final answer
    x = 59,576.90

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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.