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Finding the Fourth Proportional to 521.12, 718.92 and 343.87

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Solution

The fourth proportional to 521.12, 718.92 and 343.87 is: 474.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.12 : 718.92 = 343.87 : x
  2. Step 2: Convert to fraction form
    521.12/718.92 = 343.87/x
  3. Step 3: Cross multiply
    521.12x = 718.92 × 343.87
  4. Step 4: Simplify right side
    521.12x = 247,213.22
  5. Step 5: Solve for x
    x = 247,213.22/521.12
  6. Step 6: Final answer
    x = 474.39

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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.