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Finding the Fourth Proportional to 809.32, 1,215.01 and 674.02

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Solution

The fourth proportional to 809.32, 1,215.01 and 674.02 is: 1,011.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.32 : 1,215.01 = 674.02 : x
  2. Step 2: Convert to fraction form
    809.32/1,215.01 = 674.02/x
  3. Step 3: Cross multiply
    809.32x = 1,215.01 × 674.02
  4. Step 4: Simplify right side
    809.32x = 818,937.67
  5. Step 5: Solve for x
    x = 818,937.67/809.32
  6. Step 6: Final answer
    x = 1,011.88

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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.