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Finding the Fourth Proportional to 213.29, 319.36 and 121.52

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Solution

The fourth proportional to 213.29, 319.36 and 121.52 is: 181.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    213.29 : 319.36 = 121.52 : x
  2. Step 2: Convert to fraction form
    213.29/319.36 = 121.52/x
  3. Step 3: Cross multiply
    213.29x = 319.36 × 121.52
  4. Step 4: Simplify right side
    213.29x = 38,808.63
  5. Step 5: Solve for x
    x = 38,808.63/213.29
  6. Step 6: Final answer
    x = 181.95

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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.