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Finding the Fourth Proportional to 153.91, 212.40 and 91.75

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Solution

The fourth proportional to 153.91, 212.40 and 91.75 is: 126.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.91 : 212.40 = 91.75 : x
  2. Step 2: Convert to fraction form
    153.91/212.40 = 91.75/x
  3. Step 3: Cross multiply
    153.91x = 212.40 × 91.75
  4. Step 4: Simplify right side
    153.91x = 19,486.64
  5. Step 5: Solve for x
    x = 19,486.64/153.91
  6. Step 6: Final answer
    x = 126.61

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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.