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Finding the Fourth Proportional to 289.68, 399.77 and 165.30

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Solution

The fourth proportional to 289.68, 399.77 and 165.30 is: 228.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.68 : 399.77 = 165.30 : x
  2. Step 2: Convert to fraction form
    289.68/399.77 = 165.30/x
  3. Step 3: Cross multiply
    289.68x = 399.77 × 165.30
  4. Step 4: Simplify right side
    289.68x = 66,081.98
  5. Step 5: Solve for x
    x = 66,081.98/289.68
  6. Step 6: Final answer
    x = 228.12

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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.