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Finding the Fourth Proportional to 154.45, 213.07 and 99.17

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Solution

The fourth proportional to 154.45, 213.07 and 99.17 is: 136.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.45 : 213.07 = 99.17 : x
  2. Step 2: Convert to fraction form
    154.45/213.07 = 99.17/x
  3. Step 3: Cross multiply
    154.45x = 213.07 × 99.17
  4. Step 4: Simplify right side
    154.45x = 21,128.59
  5. Step 5: Solve for x
    x = 21,128.59/154.45
  6. Step 6: Final answer
    x = 136.80

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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.