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Finding the Fourth Proportional to 153.50, 211.78 and 116.75

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Solution

The fourth proportional to 153.50, 211.78 and 116.75 is: 161.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.50 : 211.78 = 116.75 : x
  2. Step 2: Convert to fraction form
    153.50/211.78 = 116.75/x
  3. Step 3: Cross multiply
    153.50x = 211.78 × 116.75
  4. Step 4: Simplify right side
    153.50x = 24,725.32
  5. Step 5: Solve for x
    x = 24,725.32/153.50
  6. Step 6: Final answer
    x = 161.08

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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.