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Finding the Fourth Proportional to 387.99, 582.03 and 205.20

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Solution

The fourth proportional to 387.99, 582.03 and 205.20 is: 307.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.99 : 582.03 = 205.20 : x
  2. Step 2: Convert to fraction form
    387.99/582.03 = 205.20/x
  3. Step 3: Cross multiply
    387.99x = 582.03 × 205.20
  4. Step 4: Simplify right side
    387.99x = 119,432.56
  5. Step 5: Solve for x
    x = 119,432.56/387.99
  6. Step 6: Final answer
    x = 307.82

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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.