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Finding the Fourth Proportional to 266.45, 399.39 and 129.30

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Solution

The fourth proportional to 266.45, 399.39 and 129.30 is: 193.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    266.45 : 399.39 = 129.30 : x
  2. Step 2: Convert to fraction form
    266.45/399.39 = 129.30/x
  3. Step 3: Cross multiply
    266.45x = 399.39 × 129.30
  4. Step 4: Simplify right side
    266.45x = 51,641.13
  5. Step 5: Solve for x
    x = 51,641.13/266.45
  6. Step 6: Final answer
    x = 193.82

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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.