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Finding the Fourth Proportional to 821.78, 1,231.56 and 301.29

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Solution

The fourth proportional to 821.78, 1,231.56 and 301.29 is: 451.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.78 : 1,231.56 = 301.29 : x
  2. Step 2: Convert to fraction form
    821.78/1,231.56 = 301.29/x
  3. Step 3: Cross multiply
    821.78x = 1,231.56 × 301.29
  4. Step 4: Simplify right side
    821.78x = 371,056.71
  5. Step 5: Solve for x
    x = 371,056.71/821.78
  6. Step 6: Final answer
    x = 451.53

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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.