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Finding the Fourth Proportional to 153.21, 211.49 and 98

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Solution

The fourth proportional to 153.21, 211.49 and 98 is: 135.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.21 : 211.49 = 98 : x
  2. Step 2: Convert to fraction form
    153.21/211.49 = 98/x
  3. Step 3: Cross multiply
    153.21x = 211.49 × 98
  4. Step 4: Simplify right side
    153.21x = 20,726.02
  5. Step 5: Solve for x
    x = 20,726.02/153.21
  6. Step 6: Final answer
    x = 135.28

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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.