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Finding the Fourth Proportional to 289.74, 399.81 and 165.39

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Solution

The fourth proportional to 289.74, 399.81 and 165.39 is: 228.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.74 : 399.81 = 165.39 : x
  2. Step 2: Convert to fraction form
    289.74/399.81 = 165.39/x
  3. Step 3: Cross multiply
    289.74x = 399.81 × 165.39
  4. Step 4: Simplify right side
    289.74x = 66,124.58
  5. Step 5: Solve for x
    x = 66,124.58/289.74
  6. Step 6: Final answer
    x = 228.22

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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.