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Finding the Fourth Proportional to 67.30, 92.10 and 66.58

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Solution

The fourth proportional to 67.30, 92.10 and 66.58 is: 91.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.30 : 92.10 = 66.58 : x
  2. Step 2: Convert to fraction form
    67.30/92.10 = 66.58/x
  3. Step 3: Cross multiply
    67.30x = 92.10 × 66.58
  4. Step 4: Simplify right side
    67.30x = 6,132.02
  5. Step 5: Solve for x
    x = 6,132.02/67.30
  6. Step 6: Final answer
    x = 91.11

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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.