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Finding the Fourth Proportional to 416.21, 574.40 and 285.39

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Solution

The fourth proportional to 416.21, 574.40 and 285.39 is: 393.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    416.21 : 574.40 = 285.39 : x
  2. Step 2: Convert to fraction form
    416.21/574.40 = 285.39/x
  3. Step 3: Cross multiply
    416.21x = 574.40 × 285.39
  4. Step 4: Simplify right side
    416.21x = 163,928.02
  5. Step 5: Solve for x
    x = 163,928.02/416.21
  6. Step 6: Final answer
    x = 393.86

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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.