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Finding the Fourth Proportional to 153.75, 211.91 and 113.79

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Solution

The fourth proportional to 153.75, 211.91 and 113.79 is: 156.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.75 : 211.91 = 113.79 : x
  2. Step 2: Convert to fraction form
    153.75/211.91 = 113.79/x
  3. Step 3: Cross multiply
    153.75x = 211.91 × 113.79
  4. Step 4: Simplify right side
    153.75x = 24,112.49
  5. Step 5: Solve for x
    x = 24,112.49/153.75
  6. Step 6: Final answer
    x = 156.83

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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.