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Finding the Fourth Proportional to 819.70, 1,229.53 and 271.66

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Solution

The fourth proportional to 819.70, 1,229.53 and 271.66 is: 407.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    819.70 : 1,229.53 = 271.66 : x
  2. Step 2: Convert to fraction form
    819.70/1,229.53 = 271.66/x
  3. Step 3: Cross multiply
    819.70x = 1,229.53 × 271.66
  4. Step 4: Simplify right side
    819.70x = 334,014.12
  5. Step 5: Solve for x
    x = 334,014.12/819.70
  6. Step 6: Final answer
    x = 407.48

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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.