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Finding the Fourth Proportional to 92.80, 139.10 and 71.38

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Solution

The fourth proportional to 92.80, 139.10 and 71.38 is: 106.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.80 : 139.10 = 71.38 : x
  2. Step 2: Convert to fraction form
    92.80/139.10 = 71.38/x
  3. Step 3: Cross multiply
    92.80x = 139.10 × 71.38
  4. Step 4: Simplify right side
    92.80x = 9,928.96
  5. Step 5: Solve for x
    x = 9,928.96/92.80
  6. Step 6: Final answer
    x = 106.99

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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.