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Finding the Fourth Proportional to 67.72, 93.54 and 61.64

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Solution

The fourth proportional to 67.72, 93.54 and 61.64 is: 85.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.72 : 93.54 = 61.64 : x
  2. Step 2: Convert to fraction form
    67.72/93.54 = 61.64/x
  3. Step 3: Cross multiply
    67.72x = 93.54 × 61.64
  4. Step 4: Simplify right side
    67.72x = 5,765.81
  5. Step 5: Solve for x
    x = 5,765.81/67.72
  6. Step 6: Final answer
    x = 85.14

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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.