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Finding the Fourth Proportional to 67.20, 100.86 and 46.71

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Solution

The fourth proportional to 67.20, 100.86 and 46.71 is: 70.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.20 : 100.86 = 46.71 : x
  2. Step 2: Convert to fraction form
    67.20/100.86 = 46.71/x
  3. Step 3: Cross multiply
    67.20x = 100.86 × 46.71
  4. Step 4: Simplify right side
    67.20x = 4,711.17
  5. Step 5: Solve for x
    x = 4,711.17/67.20
  6. Step 6: Final answer
    x = 70.11

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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.