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Finding the Fourth Proportional to 18,609, 25,680.42 and 11,158.44

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Solution

The fourth proportional to 18,609, 25,680.42 and 11,158.44 is: 15,398.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,609 : 25,680.42 = 11,158.44 : x
  2. Step 2: Convert to fraction form
    18,609/25,680.42 = 11,158.44/x
  3. Step 3: Cross multiply
    18,609x = 25,680.42 × 11,158.44
  4. Step 4: Simplify right side
    18,609x = 286,553,425.74
  5. Step 5: Solve for x
    x = 286,553,425.74/18,609
  6. Step 6: Final answer
    x = 15,398.65

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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.