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Finding the Fourth Proportional to 266.50, 399.74 and 90.82

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Solution

The fourth proportional to 266.50, 399.74 and 90.82 is: 136.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    266.50 : 399.74 = 90.82 : x
  2. Step 2: Convert to fraction form
    266.50/399.74 = 90.82/x
  3. Step 3: Cross multiply
    266.50x = 399.74 × 90.82
  4. Step 4: Simplify right side
    266.50x = 36,302.39
  5. Step 5: Solve for x
    x = 36,302.39/266.50
  6. Step 6: Final answer
    x = 136.22

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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.