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Finding the Fourth Proportional to 135.57, 187.20 and 92.10

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Solution

The fourth proportional to 135.57, 187.20 and 92.10 is: 127.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    135.57 : 187.20 = 92.10 : x
  2. Step 2: Convert to fraction form
    135.57/187.20 = 92.10/x
  3. Step 3: Cross multiply
    135.57x = 187.20 × 92.10
  4. Step 4: Simplify right side
    135.57x = 17,241.12
  5. Step 5: Solve for x
    x = 17,241.12/135.57
  6. Step 6: Final answer
    x = 127.18

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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.