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Finding the Fourth Proportional to 621.04, 929.92 and 388.96

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Solution

The fourth proportional to 621.04, 929.92 and 388.96 is: 582.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.04 : 929.92 = 388.96 : x
  2. Step 2: Convert to fraction form
    621.04/929.92 = 388.96/x
  3. Step 3: Cross multiply
    621.04x = 929.92 × 388.96
  4. Step 4: Simplify right side
    621.04x = 361,701.68
  5. Step 5: Solve for x
    x = 361,701.68/621.04
  6. Step 6: Final answer
    x = 582.41

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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.