Home / 15,514.40-21,409.60-8,440.78

Finding the Fourth Proportional to 15,514.40, 21,409.60 and 8,440.78

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Solution

The fourth proportional to 15,514.40, 21,409.60 and 8,440.78 is: 11,648.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,514.40 : 21,409.60 = 8,440.78 : x
  2. Step 2: Convert to fraction form
    15,514.40/21,409.60 = 8,440.78/x
  3. Step 3: Cross multiply
    15,514.40x = 21,409.60 × 8,440.78
  4. Step 4: Simplify right side
    15,514.40x = 180,713,723.49
  5. Step 5: Solve for x
    x = 180,713,723.49/15,514.40
  6. Step 6: Final answer
    x = 11,648.13

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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.