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Finding the Fourth Proportional to 67.21, 92.72 and 39.58

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Solution

The fourth proportional to 67.21, 92.72 and 39.58 is: 54.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.21 : 92.72 = 39.58 : x
  2. Step 2: Convert to fraction form
    67.21/92.72 = 39.58/x
  3. Step 3: Cross multiply
    67.21x = 92.72 × 39.58
  4. Step 4: Simplify right side
    67.21x = 3,669.72
  5. Step 5: Solve for x
    x = 3,669.72/67.21
  6. Step 6: Final answer
    x = 54.60

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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.