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Finding the Fourth Proportional to 100.45, 150.60 and 85.33

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Solution

The fourth proportional to 100.45, 150.60 and 85.33 is: 127.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.45 : 150.60 = 85.33 : x
  2. Step 2: Convert to fraction form
    100.45/150.60 = 85.33/x
  3. Step 3: Cross multiply
    100.45x = 150.60 × 85.33
  4. Step 4: Simplify right side
    100.45x = 12,849.95
  5. Step 5: Solve for x
    x = 12,849.95/100.45
  6. Step 6: Final answer
    x = 127.93

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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.