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Finding the Fourth Proportional to 402.32, 603.63 and 209.81

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Solution

The fourth proportional to 402.32, 603.63 and 209.81 is: 314.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.32 : 603.63 = 209.81 : x
  2. Step 2: Convert to fraction form
    402.32/603.63 = 209.81/x
  3. Step 3: Cross multiply
    402.32x = 603.63 × 209.81
  4. Step 4: Simplify right side
    402.32x = 126,649.12
  5. Step 5: Solve for x
    x = 126,649.12/402.32
  6. Step 6: Final answer
    x = 314.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.