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Finding the Fourth Proportional to 153.88, 212.34 and 149.92

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Solution

The fourth proportional to 153.88, 212.34 and 149.92 is: 206.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.88 : 212.34 = 149.92 : x
  2. Step 2: Convert to fraction form
    153.88/212.34 = 149.92/x
  3. Step 3: Cross multiply
    153.88x = 212.34 × 149.92
  4. Step 4: Simplify right side
    153.88x = 31,834.01
  5. Step 5: Solve for x
    x = 31,834.01/153.88
  6. Step 6: Final answer
    x = 206.88

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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.