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Finding the Fourth Proportional to 479.86, 660.15 and 423.56

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Solution

The fourth proportional to 479.86, 660.15 and 423.56 is: 582.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.86 : 660.15 = 423.56 : x
  2. Step 2: Convert to fraction form
    479.86/660.15 = 423.56/x
  3. Step 3: Cross multiply
    479.86x = 660.15 × 423.56
  4. Step 4: Simplify right side
    479.86x = 279,614.78
  5. Step 5: Solve for x
    x = 279,614.78/479.86
  6. Step 6: Final answer
    x = 582.70

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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.