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Finding the Fourth Proportional to 813.74, 1,220.02 and 380.66

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Solution

The fourth proportional to 813.74, 1,220.02 and 380.66 is: 570.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.74 : 1,220.02 = 380.66 : x
  2. Step 2: Convert to fraction form
    813.74/1,220.02 = 380.66/x
  3. Step 3: Cross multiply
    813.74x = 1,220.02 × 380.66
  4. Step 4: Simplify right side
    813.74x = 464,407.66
  5. Step 5: Solve for x
    x = 464,407.66/813.74
  6. Step 6: Final answer
    x = 570.71

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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.