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Finding the Fourth Proportional to 154.51, 213.12 and 99.22

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Solution

The fourth proportional to 154.51, 213.12 and 99.22 is: 136.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.51 : 213.12 = 99.22 : x
  2. Step 2: Convert to fraction form
    154.51/213.12 = 99.22/x
  3. Step 3: Cross multiply
    154.51x = 213.12 × 99.22
  4. Step 4: Simplify right side
    154.51x = 21,145.77
  5. Step 5: Solve for x
    x = 21,145.77/154.51
  6. Step 6: Final answer
    x = 136.86

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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.