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Finding the Fourth Proportional to 71.48, 107.76 and 70.71

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Solution

The fourth proportional to 71.48, 107.76 and 70.71 is: 106.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.48 : 107.76 = 70.71 : x
  2. Step 2: Convert to fraction form
    71.48/107.76 = 70.71/x
  3. Step 3: Cross multiply
    71.48x = 107.76 × 70.71
  4. Step 4: Simplify right side
    71.48x = 7,619.71
  5. Step 5: Solve for x
    x = 7,619.71/71.48
  6. Step 6: Final answer
    x = 106.61

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.