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Finding the Fourth Proportional to 18,613.90, 27,904.65 and 11,221.30

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Solution

The fourth proportional to 18,613.90, 27,904.65 and 11,221.30 is: 16,822.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,613.90 : 27,904.65 = 11,221.30 : x
  2. Step 2: Convert to fraction form
    18,613.90/27,904.65 = 11,221.30/x
  3. Step 3: Cross multiply
    18,613.90x = 27,904.65 × 11,221.30
  4. Step 4: Simplify right side
    18,613.90x = 313,126,449.05
  5. Step 5: Solve for x
    x = 313,126,449.05/18,613.90
  6. Step 6: Final answer
    x = 16,822.18

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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.