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Finding the Fourth Proportional to 821.11, 1,230.88 and 300.70

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Solution

The fourth proportional to 821.11, 1,230.88 and 300.70 is: 450.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.11 : 1,230.88 = 300.70 : x
  2. Step 2: Convert to fraction form
    821.11/1,230.88 = 300.70/x
  3. Step 3: Cross multiply
    821.11x = 1,230.88 × 300.70
  4. Step 4: Simplify right side
    821.11x = 370,125.62
  5. Step 5: Solve for x
    x = 370,125.62/821.11
  6. Step 6: Final answer
    x = 450.76

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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.