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Finding the Fourth Proportional to 101.64, 152.57 and 71.21

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Solution

The fourth proportional to 101.64, 152.57 and 71.21 is: 106.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    101.64 : 152.57 = 71.21 : x
  2. Step 2: Convert to fraction form
    101.64/152.57 = 71.21/x
  3. Step 3: Cross multiply
    101.64x = 152.57 × 71.21
  4. Step 4: Simplify right side
    101.64x = 10,864.54
  5. Step 5: Solve for x
    x = 10,864.54/101.64
  6. Step 6: Final answer
    x = 106.89

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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.