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Finding the Fourth Proportional to 321.76, 443.76 and 282.72

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Solution

The fourth proportional to 321.76, 443.76 and 282.72 is: 389.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    321.76 : 443.76 = 282.72 : x
  2. Step 2: Convert to fraction form
    321.76/443.76 = 282.72/x
  3. Step 3: Cross multiply
    321.76x = 443.76 × 282.72
  4. Step 4: Simplify right side
    321.76x = 125,459.83
  5. Step 5: Solve for x
    x = 125,459.83/321.76
  6. Step 6: Final answer
    x = 389.92

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.