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Finding the Fourth Proportional to 71.36, 106.98 and 34.79

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Solution

The fourth proportional to 71.36, 106.98 and 34.79 is: 52.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.36 : 106.98 = 34.79 : x
  2. Step 2: Convert to fraction form
    71.36/106.98 = 34.79/x
  3. Step 3: Cross multiply
    71.36x = 106.98 × 34.79
  4. Step 4: Simplify right side
    71.36x = 3,721.30
  5. Step 5: Solve for x
    x = 3,721.30/71.36
  6. Step 6: Final answer
    x = 52.15

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.