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Finding the Fourth Proportional to 439.86, 660.21 and 371.58

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Solution

The fourth proportional to 439.86, 660.21 and 371.58 is: 557.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.86 : 660.21 = 371.58 : x
  2. Step 2: Convert to fraction form
    439.86/660.21 = 371.58/x
  3. Step 3: Cross multiply
    439.86x = 660.21 × 371.58
  4. Step 4: Simplify right side
    439.86x = 245,320.83
  5. Step 5: Solve for x
    x = 245,320.83/439.86
  6. Step 6: Final answer
    x = 557.72

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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.