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Finding the Fourth Proportional to 140.52, 210.55 and 121.21

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Solution

The fourth proportional to 140.52, 210.55 and 121.21 is: 181.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.52 : 210.55 = 121.21 : x
  2. Step 2: Convert to fraction form
    140.52/210.55 = 121.21/x
  3. Step 3: Cross multiply
    140.52x = 210.55 × 121.21
  4. Step 4: Simplify right side
    140.52x = 25,521.57
  5. Step 5: Solve for x
    x = 25,521.57/140.52
  6. Step 6: Final answer
    x = 181.62

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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.