Home / 12,440.90-18,649.20-11,128.70

Finding the Fourth Proportional to 12,440.90, 18,649.20 and 11,128.70

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Solution

The fourth proportional to 12,440.90, 18,649.20 and 11,128.70 is: 16,682.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,440.90 : 18,649.20 = 11,128.70 : x
  2. Step 2: Convert to fraction form
    12,440.90/18,649.20 = 11,128.70/x
  3. Step 3: Cross multiply
    12,440.90x = 18,649.20 × 11,128.70
  4. Step 4: Simplify right side
    12,440.90x = 207,541,352.04
  5. Step 5: Solve for x
    x = 207,541,352.04/12,440.90
  6. Step 6: Final answer
    x = 16,682.18

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.