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Finding the Fourth Proportional to 67.34, 92.79 and 65.61

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Solution

The fourth proportional to 67.34, 92.79 and 65.61 is: 90.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.34 : 92.79 = 65.61 : x
  2. Step 2: Convert to fraction form
    67.34/92.79 = 65.61/x
  3. Step 3: Cross multiply
    67.34x = 92.79 × 65.61
  4. Step 4: Simplify right side
    67.34x = 6,087.95
  5. Step 5: Solve for x
    x = 6,087.95/67.34
  6. Step 6: Final answer
    x = 90.40

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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.