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Finding the Fourth Proportional to 154.85, 213.62 and 99.57

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Solution

The fourth proportional to 154.85, 213.62 and 99.57 is: 137.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.85 : 213.62 = 99.57 : x
  2. Step 2: Convert to fraction form
    154.85/213.62 = 99.57/x
  3. Step 3: Cross multiply
    154.85x = 213.62 × 99.57
  4. Step 4: Simplify right side
    154.85x = 21,270.14
  5. Step 5: Solve for x
    x = 21,270.14/154.85
  6. Step 6: Final answer
    x = 137.36

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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.