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Finding the Fourth Proportional to 15,687.58, 21,648.18 and 8,614.12

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Solution

The fourth proportional to 15,687.58, 21,648.18 and 8,614.12 is: 11,887.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,687.58 : 21,648.18 = 8,614.12 : x
  2. Step 2: Convert to fraction form
    15,687.58/21,648.18 = 8,614.12/x
  3. Step 3: Cross multiply
    15,687.58x = 21,648.18 × 8,614.12
  4. Step 4: Simplify right side
    15,687.58x = 186,480,020.30
  5. Step 5: Solve for x
    x = 186,480,020.30/15,687.58
  6. Step 6: Final answer
    x = 11,887.11

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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.