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Finding the Fourth Proportional to 15,062.99, 20,787.70 and 8,687.21

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Solution

The fourth proportional to 15,062.99, 20,787.70 and 8,687.21 is: 11,988.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,062.99 : 20,787.70 = 8,687.21 : x
  2. Step 2: Convert to fraction form
    15,062.99/20,787.70 = 8,687.21/x
  3. Step 3: Cross multiply
    15,062.99x = 20,787.70 × 8,687.21
  4. Step 4: Simplify right side
    15,062.99x = 180,587,145.57
  5. Step 5: Solve for x
    x = 180,587,145.57/15,062.99
  6. Step 6: Final answer
    x = 11,988.80

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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.