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Finding the Fourth Proportional to 103.41, 142.79 and 72.27

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Solution

The fourth proportional to 103.41, 142.79 and 72.27 is: 99.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.41 : 142.79 = 72.27 : x
  2. Step 2: Convert to fraction form
    103.41/142.79 = 72.27/x
  3. Step 3: Cross multiply
    103.41x = 142.79 × 72.27
  4. Step 4: Simplify right side
    103.41x = 10,319.07
  5. Step 5: Solve for x
    x = 10,319.07/103.41
  6. Step 6: Final answer
    x = 99.79

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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.