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Finding the Fourth Proportional to 71,381.40, 107,072.10 and 68,659.80

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Solution

The fourth proportional to 71,381.40, 107,072.10 and 68,659.80 is: 102,989.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,381.40 : 107,072.10 = 68,659.80 : x
  2. Step 2: Convert to fraction form
    71,381.40/107,072.10 = 68,659.80/x
  3. Step 3: Cross multiply
    71,381.40x = 107,072.10 × 68,659.80
  4. Step 4: Simplify right side
    71,381.40x = 7,351,548,971.58
  5. Step 5: Solve for x
    x = 7,351,548,971.58/71,381.40
  6. Step 6: Final answer
    x = 102,989.70

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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.