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Finding the Fourth Proportional to 100.37, 138.75 and 91.37

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Solution

The fourth proportional to 100.37, 138.75 and 91.37 is: 126.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.37 : 138.75 = 91.37 : x
  2. Step 2: Convert to fraction form
    100.37/138.75 = 91.37/x
  3. Step 3: Cross multiply
    100.37x = 138.75 × 91.37
  4. Step 4: Simplify right side
    100.37x = 12,677.59
  5. Step 5: Solve for x
    x = 12,677.59/100.37
  6. Step 6: Final answer
    x = 126.31

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.