Home / 15,687.12-21,648.24-8,613.90

Finding the Fourth Proportional to 15,687.12, 21,648.24 and 8,613.90

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Solution

The fourth proportional to 15,687.12, 21,648.24 and 8,613.90 is: 11,887.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,687.12 : 21,648.24 = 8,613.90 : x
  2. Step 2: Convert to fraction form
    15,687.12/21,648.24 = 8,613.90/x
  3. Step 3: Cross multiply
    15,687.12x = 21,648.24 × 8,613.90
  4. Step 4: Simplify right side
    15,687.12x = 186,475,774.54
  5. Step 5: Solve for x
    x = 186,475,774.54/15,687.12
  6. Step 6: Final answer
    x = 11,887.19

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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.