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Finding the Fourth Proportional to 103.71, 142.40 and 97.79

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Solution

The fourth proportional to 103.71, 142.40 and 97.79 is: 134.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.71 : 142.40 = 97.79 : x
  2. Step 2: Convert to fraction form
    103.71/142.40 = 97.79/x
  3. Step 3: Cross multiply
    103.71x = 142.40 × 97.79
  4. Step 4: Simplify right side
    103.71x = 13,924.10
  5. Step 5: Solve for x
    x = 13,924.10/103.71
  6. Step 6: Final answer
    x = 134.26

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.