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Finding the Fourth Proportional to 136.54, 188.30 and 91.60

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Solution

The fourth proportional to 136.54, 188.30 and 91.60 is: 126.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    136.54 : 188.30 = 91.60 : x
  2. Step 2: Convert to fraction form
    136.54/188.30 = 91.60/x
  3. Step 3: Cross multiply
    136.54x = 188.30 × 91.60
  4. Step 4: Simplify right side
    136.54x = 17,248.28
  5. Step 5: Solve for x
    x = 17,248.28/136.54
  6. Step 6: Final answer
    x = 126.32

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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.