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Finding the Fourth Proportional to 405.90, 560.19 and 240.12

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Solution

The fourth proportional to 405.90, 560.19 and 240.12 is: 331.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.90 : 560.19 = 240.12 : x
  2. Step 2: Convert to fraction form
    405.90/560.19 = 240.12/x
  3. Step 3: Cross multiply
    405.90x = 560.19 × 240.12
  4. Step 4: Simplify right side
    405.90x = 134,512.82
  5. Step 5: Solve for x
    x = 134,512.82/405.90
  6. Step 6: Final answer
    x = 331.39

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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.