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Finding the Fourth Proportional to 15,687.96, 21,648.04 and 8,972.52

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Solution

The fourth proportional to 15,687.96, 21,648.04 and 8,972.52 is: 12,381.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,687.96 : 21,648.04 = 8,972.52 : x
  2. Step 2: Convert to fraction form
    15,687.96/21,648.04 = 8,972.52/x
  3. Step 3: Cross multiply
    15,687.96x = 21,648.04 × 8,972.52
  4. Step 4: Simplify right side
    15,687.96x = 194,237,471.86
  5. Step 5: Solve for x
    x = 194,237,471.86/15,687.96
  6. Step 6: Final answer
    x = 12,381.31

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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.