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Finding the Fourth Proportional to 92.69, 139.07 and 85.20

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Solution

The fourth proportional to 92.69, 139.07 and 85.20 is: 127.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.69 : 139.07 = 85.20 : x
  2. Step 2: Convert to fraction form
    92.69/139.07 = 85.20/x
  3. Step 3: Cross multiply
    92.69x = 139.07 × 85.20
  4. Step 4: Simplify right side
    92.69x = 11,848.76
  5. Step 5: Solve for x
    x = 11,848.76/92.69
  6. Step 6: Final answer
    x = 127.83

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.