Home / 20,517.90-28,318.01-15,487.80

Finding the Fourth Proportional to 20,517.90, 28,318.01 and 15,487.80

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Solution

The fourth proportional to 20,517.90, 28,318.01 and 15,487.80 is: 21,375.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,517.90 : 28,318.01 = 15,487.80 : x
  2. Step 2: Convert to fraction form
    20,517.90/28,318.01 = 15,487.80/x
  3. Step 3: Cross multiply
    20,517.90x = 28,318.01 × 15,487.80
  4. Step 4: Simplify right side
    20,517.90x = 438,583,597.84
  5. Step 5: Solve for x
    x = 438,583,597.84/20,517.90
  6. Step 6: Final answer
    x = 21,375.66

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.