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Finding the Fourth Proportional to 439.60, 606.64 and 243.12

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Solution

The fourth proportional to 439.60, 606.64 and 243.12 is: 335.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.60 : 606.64 = 243.12 : x
  2. Step 2: Convert to fraction form
    439.60/606.64 = 243.12/x
  3. Step 3: Cross multiply
    439.60x = 606.64 × 243.12
  4. Step 4: Simplify right side
    439.60x = 147,486.92
  5. Step 5: Solve for x
    x = 147,486.92/439.60
  6. Step 6: Final answer
    x = 335.51

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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.