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Finding the Fourth Proportional to 153.88, 212.30 and 91.68

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Solution

The fourth proportional to 153.88, 212.30 and 91.68 is: 126.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.88 : 212.30 = 91.68 : x
  2. Step 2: Convert to fraction form
    153.88/212.30 = 91.68/x
  3. Step 3: Cross multiply
    153.88x = 212.30 × 91.68
  4. Step 4: Simplify right side
    153.88x = 19,462.60
  5. Step 5: Solve for x
    x = 19,462.60/153.88
  6. Step 6: Final answer
    x = 126.48

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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.