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Finding the Fourth Proportional to 92.90, 139.21 and 76.75

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Solution

The fourth proportional to 92.90, 139.21 and 76.75 is: 115.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.90 : 139.21 = 76.75 : x
  2. Step 2: Convert to fraction form
    92.90/139.21 = 76.75/x
  3. Step 3: Cross multiply
    92.90x = 139.21 × 76.75
  4. Step 4: Simplify right side
    92.90x = 10,683.86
  5. Step 5: Solve for x
    x = 10,683.86/92.90
  6. Step 6: Final answer
    x = 115.01

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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.