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Finding the Fourth Proportional to 821.18, 1,231.50 and 358.94

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Solution

The fourth proportional to 821.18, 1,231.50 and 358.94 is: 538.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.18 : 1,231.50 = 358.94 : x
  2. Step 2: Convert to fraction form
    821.18/1,231.50 = 358.94/x
  3. Step 3: Cross multiply
    821.18x = 1,231.50 × 358.94
  4. Step 4: Simplify right side
    821.18x = 442,034.61
  5. Step 5: Solve for x
    x = 442,034.61/821.18
  6. Step 6: Final answer
    x = 538.29

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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.