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Finding the Fourth Proportional to 18,686.78, 25,786.77 and 11,613.05

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Solution

The fourth proportional to 18,686.78, 25,786.77 and 11,613.05 is: 16,025.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,686.78 : 25,786.77 = 11,613.05 : x
  2. Step 2: Convert to fraction form
    18,686.78/25,786.77 = 11,613.05/x
  3. Step 3: Cross multiply
    18,686.78x = 25,786.77 × 11,613.05
  4. Step 4: Simplify right side
    18,686.78x = 299,462,920.41
  5. Step 5: Solve for x
    x = 299,462,920.41/18,686.78
  6. Step 6: Final answer
    x = 16,025.39

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Half scale
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Double scale
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Similar ratio
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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.