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Finding the Fourth Proportional to 521.21, 718.39 and 395.13

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Solution

The fourth proportional to 521.21, 718.39 and 395.13 is: 544.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.21 : 718.39 = 395.13 : x
  2. Step 2: Convert to fraction form
    521.21/718.39 = 395.13/x
  3. Step 3: Cross multiply
    521.21x = 718.39 × 395.13
  4. Step 4: Simplify right side
    521.21x = 283,861.75
  5. Step 5: Solve for x
    x = 283,861.75/521.21
  6. Step 6: Final answer
    x = 544.62

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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.