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Finding the Fourth Proportional to 92.58, 139.02 and 69.90

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Solution

The fourth proportional to 92.58, 139.02 and 69.90 is: 104.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.58 : 139.02 = 69.90 : x
  2. Step 2: Convert to fraction form
    92.58/139.02 = 69.90/x
  3. Step 3: Cross multiply
    92.58x = 139.02 × 69.90
  4. Step 4: Simplify right side
    92.58x = 9,717.50
  5. Step 5: Solve for x
    x = 9,717.50/92.58
  6. Step 6: Final answer
    x = 104.96

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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.