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Finding the Fourth Proportional to 521.28, 719.10 and 324.72

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Solution

The fourth proportional to 521.28, 719.10 and 324.72 is: 447.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.28 : 719.10 = 324.72 : x
  2. Step 2: Convert to fraction form
    521.28/719.10 = 324.72/x
  3. Step 3: Cross multiply
    521.28x = 719.10 × 324.72
  4. Step 4: Simplify right side
    521.28x = 233,506.15
  5. Step 5: Solve for x
    x = 233,506.15/521.28
  6. Step 6: Final answer
    x = 447.95

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Double scale
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Similar ratio
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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.