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Finding the Fourth Proportional to 153.58, 211.86 and 91.39

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Solution

The fourth proportional to 153.58, 211.86 and 91.39 is: 126.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.58 : 211.86 = 91.39 : x
  2. Step 2: Convert to fraction form
    153.58/211.86 = 91.39/x
  3. Step 3: Cross multiply
    153.58x = 211.86 × 91.39
  4. Step 4: Simplify right side
    153.58x = 19,361.89
  5. Step 5: Solve for x
    x = 19,361.89/153.58
  6. Step 6: Final answer
    x = 126.07

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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.