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Finding the Fourth Proportional to 266.45, 399.66 and 71.45

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Solution

The fourth proportional to 266.45, 399.66 and 71.45 is: 107.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    266.45 : 399.66 = 71.45 : x
  2. Step 2: Convert to fraction form
    266.45/399.66 = 71.45/x
  3. Step 3: Cross multiply
    266.45x = 399.66 × 71.45
  4. Step 4: Simplify right side
    266.45x = 28,553.71
  5. Step 5: Solve for x
    x = 28,553.71/266.45
  6. Step 6: Final answer
    x = 107.17

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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.