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Finding the Fourth Proportional to 135.90, 187.34 and 111.31

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Solution

The fourth proportional to 135.90, 187.34 and 111.31 is: 153.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    135.90 : 187.34 = 111.31 : x
  2. Step 2: Convert to fraction form
    135.90/187.34 = 111.31/x
  3. Step 3: Cross multiply
    135.90x = 187.34 × 111.31
  4. Step 4: Simplify right side
    135.90x = 20,851.79
  5. Step 5: Solve for x
    x = 20,851.79/135.90
  6. Step 6: Final answer
    x = 153.43

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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.