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Finding the Fourth Proportional to 152.11, 209.80 and 102.97

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Solution

The fourth proportional to 152.11, 209.80 and 102.97 is: 142.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    152.11 : 209.80 = 102.97 : x
  2. Step 2: Convert to fraction form
    152.11/209.80 = 102.97/x
  3. Step 3: Cross multiply
    152.11x = 209.80 × 102.97
  4. Step 4: Simplify right side
    152.11x = 21,603.11
  5. Step 5: Solve for x
    x = 21,603.11/152.11
  6. Step 6: Final answer
    x = 142.02

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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.