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Finding the Fourth Proportional to 67.88, 93.20 and 61.40

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Solution

The fourth proportional to 67.88, 93.20 and 61.40 is: 84.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.88 : 93.20 = 61.40 : x
  2. Step 2: Convert to fraction form
    67.88/93.20 = 61.40/x
  3. Step 3: Cross multiply
    67.88x = 93.20 × 61.40
  4. Step 4: Simplify right side
    67.88x = 5,722.48
  5. Step 5: Solve for x
    x = 5,722.48/67.88
  6. Step 6: Final answer
    x = 84.30

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.