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Finding the Fourth Proportional to 135.48, 186.70 and 128.38

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Solution

The fourth proportional to 135.48, 186.70 and 128.38 is: 176.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    135.48 : 186.70 = 128.38 : x
  2. Step 2: Convert to fraction form
    135.48/186.70 = 128.38/x
  3. Step 3: Cross multiply
    135.48x = 186.70 × 128.38
  4. Step 4: Simplify right side
    135.48x = 23,968.55
  5. Step 5: Solve for x
    x = 23,968.55/135.48
  6. Step 6: Final answer
    x = 176.92

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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.