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Finding the Fourth Proportional to 320.92, 440.03 and 289.72

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Solution

The fourth proportional to 320.92, 440.03 and 289.72 is: 397.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.92 : 440.03 = 289.72 : x
  2. Step 2: Convert to fraction form
    320.92/440.03 = 289.72/x
  3. Step 3: Cross multiply
    320.92x = 440.03 × 289.72
  4. Step 4: Simplify right side
    320.92x = 127,485.49
  5. Step 5: Solve for x
    x = 127,485.49/320.92
  6. Step 6: Final answer
    x = 397.25

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.