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Finding the Fourth Proportional to 153.18, 211.12 and 122.20

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Solution

The fourth proportional to 153.18, 211.12 and 122.20 is: 168.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.18 : 211.12 = 122.20 : x
  2. Step 2: Convert to fraction form
    153.18/211.12 = 122.20/x
  3. Step 3: Cross multiply
    153.18x = 211.12 × 122.20
  4. Step 4: Simplify right side
    153.18x = 25,798.86
  5. Step 5: Solve for x
    x = 25,798.86/153.18
  6. Step 6: Final answer
    x = 168.42

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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.