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Finding the Fourth Proportional to 25,479.60, 38,218 and 7,947.40

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Solution

The fourth proportional to 25,479.60, 38,218 and 7,947.40 is: 11,920.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    25,479.60 : 38,218 = 7,947.40 : x
  2. Step 2: Convert to fraction form
    25,479.60/38,218 = 7,947.40/x
  3. Step 3: Cross multiply
    25,479.60x = 38,218 × 7,947.40
  4. Step 4: Simplify right side
    25,479.60x = 303,733,733.20
  5. Step 5: Solve for x
    x = 303,733,733.20/25,479.60
  6. Step 6: Final answer
    x = 11,920.66

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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.