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Finding the Fourth Proportional to 405.52, 560.07 and 361.78

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Solution

The fourth proportional to 405.52, 560.07 and 361.78 is: 499.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.52 : 560.07 = 361.78 : x
  2. Step 2: Convert to fraction form
    405.52/560.07 = 361.78/x
  3. Step 3: Cross multiply
    405.52x = 560.07 × 361.78
  4. Step 4: Simplify right side
    405.52x = 202,622.12
  5. Step 5: Solve for x
    x = 202,622.12/405.52
  6. Step 6: Final answer
    x = 499.66

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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.