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Finding the Fourth Proportional to 521.72, 719.99 and 351.61

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Solution

The fourth proportional to 521.72, 719.99 and 351.61 is: 485.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.72 : 719.99 = 351.61 : x
  2. Step 2: Convert to fraction form
    521.72/719.99 = 351.61/x
  3. Step 3: Cross multiply
    521.72x = 719.99 × 351.61
  4. Step 4: Simplify right side
    521.72x = 253,155.42
  5. Step 5: Solve for x
    x = 253,155.42/521.72
  6. Step 6: Final answer
    x = 485.23

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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.