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Finding the Fourth Proportional to 71,818.74, 107,739.80 and 21,222.90

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Solution

The fourth proportional to 71,818.74, 107,739.80 and 21,222.90 is: 31,837.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,818.74 : 107,739.80 = 21,222.90 : x
  2. Step 2: Convert to fraction form
    71,818.74/107,739.80 = 21,222.90/x
  3. Step 3: Cross multiply
    71,818.74x = 107,739.80 × 21,222.90
  4. Step 4: Simplify right side
    71,818.74x = 2,286,551,001.42
  5. Step 5: Solve for x
    x = 2,286,551,001.42/71,818.74
  6. Step 6: Final answer
    x = 31,837.80

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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.