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Finding the Fourth Proportional to 289.90, 400.08 and 165.56

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Solution

The fourth proportional to 289.90, 400.08 and 165.56 is: 228.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.90 : 400.08 = 165.56 : x
  2. Step 2: Convert to fraction form
    289.90/400.08 = 165.56/x
  3. Step 3: Cross multiply
    289.90x = 400.08 × 165.56
  4. Step 4: Simplify right side
    289.90x = 66,238.66
  5. Step 5: Solve for x
    x = 66,238.66/289.90
  6. Step 6: Final answer
    x = 228.49

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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.