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Finding the Fourth Proportional to 18,686.90, 25,786.95 and 11,613.17

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Solution

The fourth proportional to 18,686.90, 25,786.95 and 11,613.17 is: 16,025.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,686.90 : 25,786.95 = 11,613.17 : x
  2. Step 2: Convert to fraction form
    18,686.90/25,786.95 = 11,613.17/x
  3. Step 3: Cross multiply
    18,686.90x = 25,786.95 × 11,613.17
  4. Step 4: Simplify right side
    18,686.90x = 299,468,234.13
  5. Step 5: Solve for x
    x = 299,468,234.13/18,686.90
  6. Step 6: Final answer
    x = 16,025.57

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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.