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Finding the Fourth Proportional to 101.87, 152.09 and 91.63

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Solution

The fourth proportional to 101.87, 152.09 and 91.63 is: 136.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    101.87 : 152.09 = 91.63 : x
  2. Step 2: Convert to fraction form
    101.87/152.09 = 91.63/x
  3. Step 3: Cross multiply
    101.87x = 152.09 × 91.63
  4. Step 4: Simplify right side
    101.87x = 13,935.86
  5. Step 5: Solve for x
    x = 13,935.86/101.87
  6. Step 6: Final answer
    x = 136.81

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.