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Finding the Fourth Proportional to 101.51, 151.98 and 67.20

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Solution

The fourth proportional to 101.51, 151.98 and 67.20 is: 100.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    101.51 : 151.98 = 67.20 : x
  2. Step 2: Convert to fraction form
    101.51/151.98 = 67.20/x
  3. Step 3: Cross multiply
    101.51x = 151.98 × 67.20
  4. Step 4: Simplify right side
    101.51x = 10,213.06
  5. Step 5: Solve for x
    x = 10,213.06/101.51
  6. Step 6: Final answer
    x = 100.61

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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.