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Finding the Fourth Proportional to 387.58, 582.21 and 285.52

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Solution

The fourth proportional to 387.58, 582.21 and 285.52 is: 428.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.58 : 582.21 = 285.52 : x
  2. Step 2: Convert to fraction form
    387.58/582.21 = 285.52/x
  3. Step 3: Cross multiply
    387.58x = 582.21 × 285.52
  4. Step 4: Simplify right side
    387.58x = 166,232.60
  5. Step 5: Solve for x
    x = 166,232.60/387.58
  6. Step 6: Final answer
    x = 428.90

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.