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Finding the Fourth Proportional to 67.65, 101.46 and 18.90

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Solution

The fourth proportional to 67.65, 101.46 and 18.90 is: 28.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.65 : 101.46 = 18.90 : x
  2. Step 2: Convert to fraction form
    67.65/101.46 = 18.90/x
  3. Step 3: Cross multiply
    67.65x = 101.46 × 18.90
  4. Step 4: Simplify right side
    67.65x = 1,918.05
  5. Step 5: Solve for x
    x = 1,918.05/67.65
  6. Step 6: Final answer
    x = 28.35

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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.