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Finding the Fourth Proportional to 818.42, 1,227.90 and 645.17

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Solution

The fourth proportional to 818.42, 1,227.90 and 645.17 is: 967.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.42 : 1,227.90 = 645.17 : x
  2. Step 2: Convert to fraction form
    818.42/1,227.90 = 645.17/x
  3. Step 3: Cross multiply
    818.42x = 1,227.90 × 645.17
  4. Step 4: Simplify right side
    818.42x = 792,204.24
  5. Step 5: Solve for x
    x = 792,204.24/818.42
  6. Step 6: Final answer
    x = 967.97

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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.