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Finding the Fourth Proportional to 408.48, 611.58 and 278.32

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Solution

The fourth proportional to 408.48, 611.58 and 278.32 is: 416.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.48 : 611.58 = 278.32 : x
  2. Step 2: Convert to fraction form
    408.48/611.58 = 278.32/x
  3. Step 3: Cross multiply
    408.48x = 611.58 × 278.32
  4. Step 4: Simplify right side
    408.48x = 170,214.95
  5. Step 5: Solve for x
    x = 170,214.95/408.48
  6. Step 6: Final answer
    x = 416.70

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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.