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Finding the Fourth Proportional to 67.90, 93.69 and 40.28

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Solution

The fourth proportional to 67.90, 93.69 and 40.28 is: 55.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.90 : 93.69 = 40.28 : x
  2. Step 2: Convert to fraction form
    67.90/93.69 = 40.28/x
  3. Step 3: Cross multiply
    67.90x = 93.69 × 40.28
  4. Step 4: Simplify right side
    67.90x = 3,773.72
  5. Step 5: Solve for x
    x = 3,773.72/67.90
  6. Step 6: Final answer
    x = 55.57

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.