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Finding the Fourth Proportional to 100.86, 151.05 and 68.25

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Solution

The fourth proportional to 100.86, 151.05 and 68.25 is: 102.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.86 : 151.05 = 68.25 : x
  2. Step 2: Convert to fraction form
    100.86/151.05 = 68.25/x
  3. Step 3: Cross multiply
    100.86x = 151.05 × 68.25
  4. Step 4: Simplify right side
    100.86x = 10,309.16
  5. Step 5: Solve for x
    x = 10,309.16/100.86
  6. Step 6: Final answer
    x = 102.21

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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.