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Finding the Fourth Proportional to 289.98, 399.71 and 266.15

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Solution

The fourth proportional to 289.98, 399.71 and 266.15 is: 366.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.98 : 399.71 = 266.15 : x
  2. Step 2: Convert to fraction form
    289.98/399.71 = 266.15/x
  3. Step 3: Cross multiply
    289.98x = 399.71 × 266.15
  4. Step 4: Simplify right side
    289.98x = 106,379.49
  5. Step 5: Solve for x
    x = 106,379.49/289.98
  6. Step 6: Final answer
    x = 366.85

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.