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Finding the Fourth Proportional to 289.25, 399.27 and 201.77

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Solution

The fourth proportional to 289.25, 399.27 and 201.77 is: 278.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.25 : 399.27 = 201.77 : x
  2. Step 2: Convert to fraction form
    289.25/399.27 = 201.77/x
  3. Step 3: Cross multiply
    289.25x = 399.27 × 201.77
  4. Step 4: Simplify right side
    289.25x = 80,560.71
  5. Step 5: Solve for x
    x = 80,560.71/289.25
  6. Step 6: Final answer
    x = 278.52

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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.