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Finding the Fourth Proportional to 134.48, 201.40 and 91

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Solution

The fourth proportional to 134.48, 201.40 and 91 is: 136.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    134.48 : 201.40 = 91 : x
  2. Step 2: Convert to fraction form
    134.48/201.40 = 91/x
  3. Step 3: Cross multiply
    134.48x = 201.40 × 91
  4. Step 4: Simplify right side
    134.48x = 18,327.40
  5. Step 5: Solve for x
    x = 18,327.40/134.48
  6. Step 6: Final answer
    x = 136.28

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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.