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Finding the Fourth Proportional to 765.56, 1,148.34 and 217.74

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Solution

The fourth proportional to 765.56, 1,148.34 and 217.74 is: 326.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.56 : 1,148.34 = 217.74 : x
  2. Step 2: Convert to fraction form
    765.56/1,148.34 = 217.74/x
  3. Step 3: Cross multiply
    765.56x = 1,148.34 × 217.74
  4. Step 4: Simplify right side
    765.56x = 250,039.55
  5. Step 5: Solve for x
    x = 250,039.55/765.56
  6. Step 6: Final answer
    x = 326.61

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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.