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Finding the Fourth Proportional to 153.47, 211.85 and 98.21

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Solution

The fourth proportional to 153.47, 211.85 and 98.21 is: 135.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.47 : 211.85 = 98.21 : x
  2. Step 2: Convert to fraction form
    153.47/211.85 = 98.21/x
  3. Step 3: Cross multiply
    153.47x = 211.85 × 98.21
  4. Step 4: Simplify right side
    153.47x = 20,804.24
  5. Step 5: Solve for x
    x = 20,804.24/153.47
  6. Step 6: Final answer
    x = 135.56

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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.