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Finding the Fourth Proportional to 28,921.60, 43,398.60 and 12,278.80

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Solution

The fourth proportional to 28,921.60, 43,398.60 and 12,278.80 is: 18,425.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,921.60 : 43,398.60 = 12,278.80 : x
  2. Step 2: Convert to fraction form
    28,921.60/43,398.60 = 12,278.80/x
  3. Step 3: Cross multiply
    28,921.60x = 43,398.60 × 12,278.80
  4. Step 4: Simplify right side
    28,921.60x = 532,882,729.68
  5. Step 5: Solve for x
    x = 532,882,729.68/28,921.60
  6. Step 6: Final answer
    x = 18,425.08

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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.