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Finding the Fourth Proportional to 289.72, 399.80 and 165.40

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Solution

The fourth proportional to 289.72, 399.80 and 165.40 is: 228.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.72 : 399.80 = 165.40 : x
  2. Step 2: Convert to fraction form
    289.72/399.80 = 165.40/x
  3. Step 3: Cross multiply
    289.72x = 399.80 × 165.40
  4. Step 4: Simplify right side
    289.72x = 66,126.92
  5. Step 5: Solve for x
    x = 66,126.92/289.72
  6. Step 6: Final answer
    x = 228.24

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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.