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Finding the Fourth Proportional to 1,304.20, 1,956.62 and 920.20

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Solution

The fourth proportional to 1,304.20, 1,956.62 and 920.20 is: 1,380.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,304.20 : 1,956.62 = 920.20 : x
  2. Step 2: Convert to fraction form
    1,304.20/1,956.62 = 920.20/x
  3. Step 3: Cross multiply
    1,304.20x = 1,956.62 × 920.20
  4. Step 4: Simplify right side
    1,304.20x = 1,800,481.72
  5. Step 5: Solve for x
    x = 1,800,481.72/1,304.20
  6. Step 6: Final answer
    x = 1,380.53

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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.