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Finding the Fourth Proportional to 154.66, 213.38 and 99.36

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Solution

The fourth proportional to 154.66, 213.38 and 99.36 is: 137.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.66 : 213.38 = 99.36 : x
  2. Step 2: Convert to fraction form
    154.66/213.38 = 99.36/x
  3. Step 3: Cross multiply
    154.66x = 213.38 × 99.36
  4. Step 4: Simplify right side
    154.66x = 21,201.44
  5. Step 5: Solve for x
    x = 21,201.44/154.66
  6. Step 6: Final answer
    x = 137.08

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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.