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Finding the Fourth Proportional to 266.68, 399.99 and 71.70

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Solution

The fourth proportional to 266.68, 399.99 and 71.70 is: 107.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    266.68 : 399.99 = 71.70 : x
  2. Step 2: Convert to fraction form
    266.68/399.99 = 71.70/x
  3. Step 3: Cross multiply
    266.68x = 399.99 × 71.70
  4. Step 4: Simplify right side
    266.68x = 28,676.92
  5. Step 5: Solve for x
    x = 28,676.92/266.68
  6. Step 6: Final answer
    x = 107.53

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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.