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Finding the Fourth Proportional to 18,421.43, 25,401.42 and 12,442.71

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Solution

The fourth proportional to 18,421.43, 25,401.42 and 12,442.71 is: 17,157.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,421.43 : 25,401.42 = 12,442.71 : x
  2. Step 2: Convert to fraction form
    18,421.43/25,401.42 = 12,442.71/x
  3. Step 3: Cross multiply
    18,421.43x = 25,401.42 × 12,442.71
  4. Step 4: Simplify right side
    18,421.43x = 316,062,502.65
  5. Step 5: Solve for x
    x = 316,062,502.65/18,421.43
  6. Step 6: Final answer
    x = 17,157.33

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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.