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Finding the Fourth Proportional to 136.78, 188.55 and 99.88

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Solution

The fourth proportional to 136.78, 188.55 and 99.88 is: 137.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    136.78 : 188.55 = 99.88 : x
  2. Step 2: Convert to fraction form
    136.78/188.55 = 99.88/x
  3. Step 3: Cross multiply
    136.78x = 188.55 × 99.88
  4. Step 4: Simplify right side
    136.78x = 18,831.90
  5. Step 5: Solve for x
    x = 18,831.90/136.78
  6. Step 6: Final answer
    x = 137.68

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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.