Home / 15,687.54-21,648.75-8,613.78

Finding the Fourth Proportional to 15,687.54, 21,648.75 and 8,613.78

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Solution

The fourth proportional to 15,687.54, 21,648.75 and 8,613.78 is: 11,886.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,687.54 : 21,648.75 = 8,613.78 : x
  2. Step 2: Convert to fraction form
    15,687.54/21,648.75 = 8,613.78/x
  3. Step 3: Cross multiply
    15,687.54x = 21,648.75 × 8,613.78
  4. Step 4: Simplify right side
    15,687.54x = 186,477,569.78
  5. Step 5: Solve for x
    x = 186,477,569.78/15,687.54
  6. Step 6: Final answer
    x = 11,886.99

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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.