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Finding the Fourth Proportional to 153.31, 211.59 and 98.11

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Solution

The fourth proportional to 153.31, 211.59 and 98.11 is: 135.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.31 : 211.59 = 98.11 : x
  2. Step 2: Convert to fraction form
    153.31/211.59 = 98.11/x
  3. Step 3: Cross multiply
    153.31x = 211.59 × 98.11
  4. Step 4: Simplify right side
    153.31x = 20,759.09
  5. Step 5: Solve for x
    x = 20,759.09/153.31
  6. Step 6: Final answer
    x = 135.41

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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.