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Finding the Fourth Proportional to 67.18, 100.66 and 53.65

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Solution

The fourth proportional to 67.18, 100.66 and 53.65 is: 80.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.18 : 100.66 = 53.65 : x
  2. Step 2: Convert to fraction form
    67.18/100.66 = 53.65/x
  3. Step 3: Cross multiply
    67.18x = 100.66 × 53.65
  4. Step 4: Simplify right side
    67.18x = 5,400.22
  5. Step 5: Solve for x
    x = 5,400.22/67.18
  6. Step 6: Final answer
    x = 80.39

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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.