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Finding the Fourth Proportional to 153.64, 212.04 and 98.38

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Solution

The fourth proportional to 153.64, 212.04 and 98.38 is: 135.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.64 : 212.04 = 98.38 : x
  2. Step 2: Convert to fraction form
    153.64/212.04 = 98.38/x
  3. Step 3: Cross multiply
    153.64x = 212.04 × 98.38
  4. Step 4: Simplify right side
    153.64x = 20,860.50
  5. Step 5: Solve for x
    x = 20,860.50/153.64
  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.