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Finding the Fourth Proportional to 100.09, 149.90 and 78.27

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Solution

The fourth proportional to 100.09, 149.90 and 78.27 is: 117.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.09 : 149.90 = 78.27 : x
  2. Step 2: Convert to fraction form
    100.09/149.90 = 78.27/x
  3. Step 3: Cross multiply
    100.09x = 149.90 × 78.27
  4. Step 4: Simplify right side
    100.09x = 11,732.67
  5. Step 5: Solve for x
    x = 11,732.67/100.09
  6. Step 6: Final answer
    x = 117.22

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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.