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Finding the Fourth Proportional to 408.60, 560.26 and 398.88

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Solution

The fourth proportional to 408.60, 560.26 and 398.88 is: 546.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.60 : 560.26 = 398.88 : x
  2. Step 2: Convert to fraction form
    408.60/560.26 = 398.88/x
  3. Step 3: Cross multiply
    408.60x = 560.26 × 398.88
  4. Step 4: Simplify right side
    408.60x = 223,476.51
  5. Step 5: Solve for x
    x = 223,476.51/408.60
  6. Step 6: Final answer
    x = 546.93

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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.