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Finding the Fourth Proportional to 288,278.40, 431,251.20 and 253,286.40

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Solution

The fourth proportional to 288,278.40, 431,251.20 and 253,286.40 is: 378,904.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    288,278.40 : 431,251.20 = 253,286.40 : x
  2. Step 2: Convert to fraction form
    288,278.40/431,251.20 = 253,286.40/x
  3. Step 3: Cross multiply
    288,278.40x = 431,251.20 × 253,286.40
  4. Step 4: Simplify right side
    288,278.40x = 109,230,063,943.68
  5. Step 5: Solve for x
    x = 109,230,063,943.68/288,278.40
  6. Step 6: Final answer
    x = 378,904.78

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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.