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Finding the Fourth Proportional to 389.28, 582.66 and 213.33

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Solution

The fourth proportional to 389.28, 582.66 and 213.33 is: 319.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.28 : 582.66 = 213.33 : x
  2. Step 2: Convert to fraction form
    389.28/582.66 = 213.33/x
  3. Step 3: Cross multiply
    389.28x = 582.66 × 213.33
  4. Step 4: Simplify right side
    389.28x = 124,298.86
  5. Step 5: Solve for x
    x = 124,298.86/389.28
  6. Step 6: Final answer
    x = 319.30

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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.