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Finding the Fourth Proportional to 100.13, 138.06 and 72.59

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Solution

The fourth proportional to 100.13, 138.06 and 72.59 is: 100.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.13 : 138.06 = 72.59 : x
  2. Step 2: Convert to fraction form
    100.13/138.06 = 72.59/x
  3. Step 3: Cross multiply
    100.13x = 138.06 × 72.59
  4. Step 4: Simplify right side
    100.13x = 10,021.09
  5. Step 5: Solve for x
    x = 10,021.09/100.13
  6. Step 6: Final answer
    x = 100.09

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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.