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Finding the Fourth Proportional to 71.54, 106.54 and 68.42

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Solution

The fourth proportional to 71.54, 106.54 and 68.42 is: 101.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.54 : 106.54 = 68.42 : x
  2. Step 2: Convert to fraction form
    71.54/106.54 = 68.42/x
  3. Step 3: Cross multiply
    71.54x = 106.54 × 68.42
  4. Step 4: Simplify right side
    71.54x = 7,289.47
  5. Step 5: Solve for x
    x = 7,289.47/71.54
  6. Step 6: Final answer
    x = 101.89

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.