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Finding the Fourth Proportional to 487.44, 671.76 and 399.60

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Solution

The fourth proportional to 487.44, 671.76 and 399.60 is: 550.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.44 : 671.76 = 399.60 : x
  2. Step 2: Convert to fraction form
    487.44/671.76 = 399.60/x
  3. Step 3: Cross multiply
    487.44x = 671.76 × 399.60
  4. Step 4: Simplify right side
    487.44x = 268,435.30
  5. Step 5: Solve for x
    x = 268,435.30/487.44
  6. Step 6: Final answer
    x = 550.70

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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.