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Finding the Fourth Proportional to 266.33, 399.53 and 83.70

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Solution

The fourth proportional to 266.33, 399.53 and 83.70 is: 125.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    266.33 : 399.53 = 83.70 : x
  2. Step 2: Convert to fraction form
    266.33/399.53 = 83.70/x
  3. Step 3: Cross multiply
    266.33x = 399.53 × 83.70
  4. Step 4: Simplify right side
    266.33x = 33,440.87
  5. Step 5: Solve for x
    x = 33,440.87/266.33
  6. Step 6: Final answer
    x = 125.56

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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.