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Finding the Fourth Proportional to 354.68, 531.99 and 111.21

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Solution

The fourth proportional to 354.68, 531.99 and 111.21 is: 166.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.68 : 531.99 = 111.21 : x
  2. Step 2: Convert to fraction form
    354.68/531.99 = 111.21/x
  3. Step 3: Cross multiply
    354.68x = 531.99 × 111.21
  4. Step 4: Simplify right side
    354.68x = 59,162.61
  5. Step 5: Solve for x
    x = 59,162.61/354.68
  6. Step 6: Final answer
    x = 166.81

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.