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Finding the Fourth Proportional to 153.76, 211.80 and 143.68

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Solution

The fourth proportional to 153.76, 211.80 and 143.68 is: 197.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.76 : 211.80 = 143.68 : x
  2. Step 2: Convert to fraction form
    153.76/211.80 = 143.68/x
  3. Step 3: Cross multiply
    153.76x = 211.80 × 143.68
  4. Step 4: Simplify right side
    153.76x = 30,431.42
  5. Step 5: Solve for x
    x = 30,431.42/153.76
  6. Step 6: Final answer
    x = 197.92

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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.