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Finding the Fourth Proportional to 101.35, 151.78 and 85.08

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Solution

The fourth proportional to 101.35, 151.78 and 85.08 is: 127.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    101.35 : 151.78 = 85.08 : x
  2. Step 2: Convert to fraction form
    101.35/151.78 = 85.08/x
  3. Step 3: Cross multiply
    101.35x = 151.78 × 85.08
  4. Step 4: Simplify right side
    101.35x = 12,913.44
  5. Step 5: Solve for x
    x = 12,913.44/101.35
  6. Step 6: Final answer
    x = 127.41

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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.