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Finding the Fourth Proportional to 25,389.40, 38,079.90 and 8,522.20

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Solution

The fourth proportional to 25,389.40, 38,079.90 and 8,522.20 is: 12,781.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    25,389.40 : 38,079.90 = 8,522.20 : x
  2. Step 2: Convert to fraction form
    25,389.40/38,079.90 = 8,522.20/x
  3. Step 3: Cross multiply
    25,389.40x = 38,079.90 × 8,522.20
  4. Step 4: Simplify right side
    25,389.40x = 324,524,523.78
  5. Step 5: Solve for x
    x = 324,524,523.78/25,389.40
  6. Step 6: Final answer
    x = 12,781.89

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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.