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Finding the Fourth Proportional to 67.56, 100.90 and 67.08

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Solution

The fourth proportional to 67.56, 100.90 and 67.08 is: 100.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.56 : 100.90 = 67.08 : x
  2. Step 2: Convert to fraction form
    67.56/100.90 = 67.08/x
  3. Step 3: Cross multiply
    67.56x = 100.90 × 67.08
  4. Step 4: Simplify right side
    67.56x = 6,768.37
  5. Step 5: Solve for x
    x = 6,768.37/67.56
  6. Step 6: Final answer
    x = 100.18

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.