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Finding the Fourth Proportional to 266.26, 399.31 and 92.90

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Solution

The fourth proportional to 266.26, 399.31 and 92.90 is: 139.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    266.26 : 399.31 = 92.90 : x
  2. Step 2: Convert to fraction form
    266.26/399.31 = 92.90/x
  3. Step 3: Cross multiply
    266.26x = 399.31 × 92.90
  4. Step 4: Simplify right side
    266.26x = 37,095.90
  5. Step 5: Solve for x
    x = 37,095.90/266.26
  6. Step 6: Final answer
    x = 139.32

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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.