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Finding the Fourth Proportional to 479.28, 657.78 and 440.40

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Solution

The fourth proportional to 479.28, 657.78 and 440.40 is: 604.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.28 : 657.78 = 440.40 : x
  2. Step 2: Convert to fraction form
    479.28/657.78 = 440.40/x
  3. Step 3: Cross multiply
    479.28x = 657.78 × 440.40
  4. Step 4: Simplify right side
    479.28x = 289,686.31
  5. Step 5: Solve for x
    x = 289,686.31/479.28
  6. Step 6: Final answer
    x = 604.42

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.