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Finding the Fourth Proportional to 888.12, 1,330.96 and 645.12

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Solution

The fourth proportional to 888.12, 1,330.96 and 645.12 is: 966.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    888.12 : 1,330.96 = 645.12 : x
  2. Step 2: Convert to fraction form
    888.12/1,330.96 = 645.12/x
  3. Step 3: Cross multiply
    888.12x = 1,330.96 × 645.12
  4. Step 4: Simplify right side
    888.12x = 858,628.92
  5. Step 5: Solve for x
    x = 858,628.92/888.12
  6. Step 6: Final answer
    x = 966.79

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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.