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Finding the Fourth Proportional to 20,957.59, 31,436.39 and 5,375.21

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Solution

The fourth proportional to 20,957.59, 31,436.39 and 5,375.21 is: 8,062.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,957.59 : 31,436.39 = 5,375.21 : x
  2. Step 2: Convert to fraction form
    20,957.59/31,436.39 = 5,375.21/x
  3. Step 3: Cross multiply
    20,957.59x = 31,436.39 × 5,375.21
  4. Step 4: Simplify right side
    20,957.59x = 168,977,200.74
  5. Step 5: Solve for x
    x = 168,977,200.74/20,957.59
  6. Step 6: Final answer
    x = 8,062.82

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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.