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Finding the Fourth Proportional to 439.60, 606.42 and 306.76

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Solution

The fourth proportional to 439.60, 606.42 and 306.76 is: 423.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.60 : 606.42 = 306.76 : x
  2. Step 2: Convert to fraction form
    439.60/606.42 = 306.76/x
  3. Step 3: Cross multiply
    439.60x = 606.42 × 306.76
  4. Step 4: Simplify right side
    439.60x = 186,025.40
  5. Step 5: Solve for x
    x = 186,025.40/439.60
  6. Step 6: Final answer
    x = 423.17

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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.