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Finding the Fourth Proportional to 92.00, 126.86 and 65.72

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Solution

The fourth proportional to 92.00, 126.86 and 65.72 is: 90.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.00 : 126.86 = 65.72 : x
  2. Step 2: Convert to fraction form
    92.00/126.86 = 65.72/x
  3. Step 3: Cross multiply
    92.00x = 126.86 × 65.72
  4. Step 4: Simplify right side
    92.00x = 8,336.60
  5. Step 5: Solve for x
    x = 8,336.60/92.00
  6. Step 6: Final answer
    x = 90.62

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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.