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Finding the Fourth Proportional to 135.23, 186.78 and 100.20

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Solution

The fourth proportional to 135.23, 186.78 and 100.20 is: 138.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    135.23 : 186.78 = 100.20 : x
  2. Step 2: Convert to fraction form
    135.23/186.78 = 100.20/x
  3. Step 3: Cross multiply
    135.23x = 186.78 × 100.20
  4. Step 4: Simplify right side
    135.23x = 18,715.36
  5. Step 5: Solve for x
    x = 18,715.36/135.23
  6. Step 6: Final answer
    x = 138.40

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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.