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Finding the Fourth Proportional to 15,687.57, 21,650.39 and 8,974.19

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Solution

The fourth proportional to 15,687.57, 21,650.39 and 8,974.19 is: 12,385.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,687.57 : 21,650.39 = 8,974.19 : x
  2. Step 2: Convert to fraction form
    15,687.57/21,650.39 = 8,974.19/x
  3. Step 3: Cross multiply
    15,687.57x = 21,650.39 × 8,974.19
  4. Step 4: Simplify right side
    15,687.57x = 194,294,756.34
  5. Step 5: Solve for x
    x = 194,294,756.34/15,687.57
  6. Step 6: Final answer
    x = 12,385.26

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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.