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Finding the Fourth Proportional to 18,418.40, 27,631.20 and 7,888.40

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Solution

The fourth proportional to 18,418.40, 27,631.20 and 7,888.40 is: 11,834.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,418.40 : 27,631.20 = 7,888.40 : x
  2. Step 2: Convert to fraction form
    18,418.40/27,631.20 = 7,888.40/x
  3. Step 3: Cross multiply
    18,418.40x = 27,631.20 × 7,888.40
  4. Step 4: Simplify right side
    18,418.40x = 217,965,958.08
  5. Step 5: Solve for x
    x = 217,965,958.08/18,418.40
  6. Step 6: Final answer
    x = 11,834.14

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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.