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Finding the Fourth Proportional to 103.40, 142.56 and 68.39

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Solution

The fourth proportional to 103.40, 142.56 and 68.39 is: 94.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.40 : 142.56 = 68.39 : x
  2. Step 2: Convert to fraction form
    103.40/142.56 = 68.39/x
  3. Step 3: Cross multiply
    103.40x = 142.56 × 68.39
  4. Step 4: Simplify right side
    103.40x = 9,748.97
  5. Step 5: Solve for x
    x = 9,748.97/103.40
  6. Step 6: Final answer
    x = 94.29

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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.