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Finding the Fourth Proportional to 389.92, 582.05 and 355.90

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Solution

The fourth proportional to 389.92, 582.05 and 355.90 is: 531.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.92 : 582.05 = 355.90 : x
  2. Step 2: Convert to fraction form
    389.92/582.05 = 355.90/x
  3. Step 3: Cross multiply
    389.92x = 582.05 × 355.90
  4. Step 4: Simplify right side
    389.92x = 207,151.60
  5. Step 5: Solve for x
    x = 207,151.60/389.92
  6. Step 6: Final answer
    x = 531.27

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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.