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Finding the Fourth Proportional to 521.12, 719.29 and 324.79

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Solution

The fourth proportional to 521.12, 719.29 and 324.79 is: 448.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.12 : 719.29 = 324.79 : x
  2. Step 2: Convert to fraction form
    521.12/719.29 = 324.79/x
  3. Step 3: Cross multiply
    521.12x = 719.29 × 324.79
  4. Step 4: Simplify right side
    521.12x = 233,618.20
  5. Step 5: Solve for x
    x = 233,618.20/521.12
  6. Step 6: Final answer
    x = 448.30

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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.