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Finding the Fourth Proportional to 218,121.40, 326,922.90 and 91,761.40

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Solution

The fourth proportional to 218,121.40, 326,922.90 and 91,761.40 is: 137,533.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,121.40 : 326,922.90 = 91,761.40 : x
  2. Step 2: Convert to fraction form
    218,121.40/326,922.90 = 91,761.40/x
  3. Step 3: Cross multiply
    218,121.40x = 326,922.90 × 91,761.40
  4. Step 4: Simplify right side
    218,121.40x = 29,998,902,996.06
  5. Step 5: Solve for x
    x = 29,998,902,996.06/218,121.40
  6. Step 6: Final answer
    x = 137,533.06

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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.