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Finding the Fourth Proportional to 821.37, 1,230.69 and 576.72

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Solution

The fourth proportional to 821.37, 1,230.69 and 576.72 is: 864.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.37 : 1,230.69 = 576.72 : x
  2. Step 2: Convert to fraction form
    821.37/1,230.69 = 576.72/x
  3. Step 3: Cross multiply
    821.37x = 1,230.69 × 576.72
  4. Step 4: Simplify right side
    821.37x = 709,765.70
  5. Step 5: Solve for x
    x = 709,765.70/821.37
  6. Step 6: Final answer
    x = 864.12

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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.