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Finding the Fourth Proportional to 135.90, 203.75 and 61.75

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Solution

The fourth proportional to 135.90, 203.75 and 61.75 is: 92.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    135.90 : 203.75 = 61.75 : x
  2. Step 2: Convert to fraction form
    135.90/203.75 = 61.75/x
  3. Step 3: Cross multiply
    135.90x = 203.75 × 61.75
  4. Step 4: Simplify right side
    135.90x = 12,581.21
  5. Step 5: Solve for x
    x = 12,581.21/135.90
  6. Step 6: Final answer
    x = 92.58

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.