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Finding the Fourth Proportional to 71.18, 106.74 and 67.40

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Solution

The fourth proportional to 71.18, 106.74 and 67.40 is: 101.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.18 : 106.74 = 67.40 : x
  2. Step 2: Convert to fraction form
    71.18/106.74 = 67.40/x
  3. Step 3: Cross multiply
    71.18x = 106.74 × 67.40
  4. Step 4: Simplify right side
    71.18x = 7,194.28
  5. Step 5: Solve for x
    x = 7,194.28/71.18
  6. Step 6: Final answer
    x = 101.07

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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.