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Finding the Fourth Proportional to 266.05, 399.09 and 83.45

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Solution

The fourth proportional to 266.05, 399.09 and 83.45 is: 125.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    266.05 : 399.09 = 83.45 : x
  2. Step 2: Convert to fraction form
    266.05/399.09 = 83.45/x
  3. Step 3: Cross multiply
    266.05x = 399.09 × 83.45
  4. Step 4: Simplify right side
    266.05x = 33,303.64
  5. Step 5: Solve for x
    x = 33,303.64/266.05
  6. Step 6: Final answer
    x = 125.18

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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.