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Finding the Fourth Proportional to 153.81, 212.16 and 98.56

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Solution

The fourth proportional to 153.81, 212.16 and 98.56 is: 135.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.81 : 212.16 = 98.56 : x
  2. Step 2: Convert to fraction form
    153.81/212.16 = 98.56/x
  3. Step 3: Cross multiply
    153.81x = 212.16 × 98.56
  4. Step 4: Simplify right side
    153.81x = 20,910.39
  5. Step 5: Solve for x
    x = 20,910.39/153.81
  6. Step 6: Final answer
    x = 135.95

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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.