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Finding the Fourth Proportional to 92.72, 127.86 and 85.40

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Solution

The fourth proportional to 92.72, 127.86 and 85.40 is: 117.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.72 : 127.86 = 85.40 : x
  2. Step 2: Convert to fraction form
    92.72/127.86 = 85.40/x
  3. Step 3: Cross multiply
    92.72x = 127.86 × 85.40
  4. Step 4: Simplify right side
    92.72x = 10,919.24
  5. Step 5: Solve for x
    x = 10,919.24/92.72
  6. Step 6: Final answer
    x = 117.77

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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.