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Finding the Fourth Proportional to 25,388.40, 38,078.40 and 8,521.20

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Solution

The fourth proportional to 25,388.40, 38,078.40 and 8,521.20 is: 12,780.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    25,388.40 : 38,078.40 = 8,521.20 : x
  2. Step 2: Convert to fraction form
    25,388.40/38,078.40 = 8,521.20/x
  3. Step 3: Cross multiply
    25,388.40x = 38,078.40 × 8,521.20
  4. Step 4: Simplify right side
    25,388.40x = 324,473,662.08
  5. Step 5: Solve for x
    x = 324,473,662.08/25,388.40
  6. Step 6: Final answer
    x = 12,780.39

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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.