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Finding the Fourth Proportional to 153.90, 212.88 and 136.68

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Solution

The fourth proportional to 153.90, 212.88 and 136.68 is: 189.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.90 : 212.88 = 136.68 : x
  2. Step 2: Convert to fraction form
    153.90/212.88 = 136.68/x
  3. Step 3: Cross multiply
    153.90x = 212.88 × 136.68
  4. Step 4: Simplify right side
    153.90x = 29,096.44
  5. Step 5: Solve for x
    x = 29,096.44/153.90
  6. Step 6: Final answer
    x = 189.06

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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.