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Finding the Fourth Proportional to 153.11, 211.23 and 100.64

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Solution

The fourth proportional to 153.11, 211.23 and 100.64 is: 138.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.11 : 211.23 = 100.64 : x
  2. Step 2: Convert to fraction form
    153.11/211.23 = 100.64/x
  3. Step 3: Cross multiply
    153.11x = 211.23 × 100.64
  4. Step 4: Simplify right side
    153.11x = 21,258.19
  5. Step 5: Solve for x
    x = 21,258.19/153.11
  6. Step 6: Final answer
    x = 138.84

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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.