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Finding the Fourth Proportional to 153.11, 211.31 and 86.74

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Solution

The fourth proportional to 153.11, 211.31 and 86.74 is: 119.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.11 : 211.31 = 86.74 : x
  2. Step 2: Convert to fraction form
    153.11/211.31 = 86.74/x
  3. Step 3: Cross multiply
    153.11x = 211.31 × 86.74
  4. Step 4: Simplify right side
    153.11x = 18,329.03
  5. Step 5: Solve for x
    x = 18,329.03/153.11
  6. Step 6: Final answer
    x = 119.71

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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.