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Finding the Fourth Proportional to 71,347.18, 107,021.58 and 18,761.98

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Solution

The fourth proportional to 71,347.18, 107,021.58 and 18,761.98 is: 28,143.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,347.18 : 107,021.58 = 18,761.98 : x
  2. Step 2: Convert to fraction form
    71,347.18/107,021.58 = 18,761.98/x
  3. Step 3: Cross multiply
    71,347.18x = 107,021.58 × 18,761.98
  4. Step 4: Simplify right side
    71,347.18x = 2,007,936,743.53
  5. Step 5: Solve for x
    x = 2,007,936,743.53/71,347.18
  6. Step 6: Final answer
    x = 28,143.18

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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.