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Finding the Fourth Proportional to 405.97, 560.21 and 240.29

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Solution

The fourth proportional to 405.97, 560.21 and 240.29 is: 331.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.97 : 560.21 = 240.29 : x
  2. Step 2: Convert to fraction form
    405.97/560.21 = 240.29/x
  3. Step 3: Cross multiply
    405.97x = 560.21 × 240.29
  4. Step 4: Simplify right side
    405.97x = 134,612.86
  5. Step 5: Solve for x
    x = 134,612.86/405.97
  6. Step 6: Final answer
    x = 331.58

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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.