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Finding the Fourth Proportional to 405.86, 605.23 and 361.60

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Solution

The fourth proportional to 405.86, 605.23 and 361.60 is: 539.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.86 : 605.23 = 361.60 : x
  2. Step 2: Convert to fraction form
    405.86/605.23 = 361.60/x
  3. Step 3: Cross multiply
    405.86x = 605.23 × 361.60
  4. Step 4: Simplify right side
    405.86x = 218,848.75
  5. Step 5: Solve for x
    x = 218,848.75/405.86
  6. Step 6: Final answer
    x = 539.23

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.