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Finding the Fourth Proportional to 154.26, 212.94 and 99

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Solution

The fourth proportional to 154.26, 212.94 and 99 is: 136.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.26 : 212.94 = 99 : x
  2. Step 2: Convert to fraction form
    154.26/212.94 = 99/x
  3. Step 3: Cross multiply
    154.26x = 212.94 × 99
  4. Step 4: Simplify right side
    154.26x = 21,081.06
  5. Step 5: Solve for x
    x = 21,081.06/154.26
  6. Step 6: Final answer
    x = 136.66

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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.