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Finding the Fourth Proportional to 140.02, 209.64 and 111.18

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Solution

The fourth proportional to 140.02, 209.64 and 111.18 is: 166.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.02 : 209.64 = 111.18 : x
  2. Step 2: Convert to fraction form
    140.02/209.64 = 111.18/x
  3. Step 3: Cross multiply
    140.02x = 209.64 × 111.18
  4. Step 4: Simplify right side
    140.02x = 23,306.81
  5. Step 5: Solve for x
    x = 23,306.81/140.02
  6. Step 6: Final answer
    x = 166.45

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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.