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Finding the Fourth Proportional to 153.71, 212.05 and 98.43

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Solution

The fourth proportional to 153.71, 212.05 and 98.43 is: 135.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.71 : 212.05 = 98.43 : x
  2. Step 2: Convert to fraction form
    153.71/212.05 = 98.43/x
  3. Step 3: Cross multiply
    153.71x = 212.05 × 98.43
  4. Step 4: Simplify right side
    153.71x = 20,871.02
  5. Step 5: Solve for x
    x = 20,871.02/153.71
  6. Step 6: Final answer
    x = 135.78

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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.