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Finding the Fourth Proportional to 67.25, 100.61 and 56.45

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Solution

The fourth proportional to 67.25, 100.61 and 56.45 is: 84.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.25 : 100.61 = 56.45 : x
  2. Step 2: Convert to fraction form
    67.25/100.61 = 56.45/x
  3. Step 3: Cross multiply
    67.25x = 100.61 × 56.45
  4. Step 4: Simplify right side
    67.25x = 5,679.05
  5. Step 5: Solve for x
    x = 5,679.05/67.25
  6. Step 6: Final answer
    x = 84.45

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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.