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Finding the Fourth Proportional to 153.68, 211.72 and 120.88

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Solution

The fourth proportional to 153.68, 211.72 and 120.88 is: 166.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.68 : 211.72 = 120.88 : x
  2. Step 2: Convert to fraction form
    153.68/211.72 = 120.88/x
  3. Step 3: Cross multiply
    153.68x = 211.72 × 120.88
  4. Step 4: Simplify right side
    153.68x = 25,592.71
  5. Step 5: Solve for x
    x = 25,592.71/153.68
  6. Step 6: Final answer
    x = 166.53

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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.