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Finding the Fourth Proportional to 92.90, 139.37 and 47.13

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Solution

The fourth proportional to 92.90, 139.37 and 47.13 is: 70.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.90 : 139.37 = 47.13 : x
  2. Step 2: Convert to fraction form
    92.90/139.37 = 47.13/x
  3. Step 3: Cross multiply
    92.90x = 139.37 × 47.13
  4. Step 4: Simplify right side
    92.90x = 6,568.27
  5. Step 5: Solve for x
    x = 6,568.27/92.90
  6. Step 6: Final answer
    x = 70.71

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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.