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Finding the Fourth Proportional to 488.86, 731.91 and 390.43

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Solution

The fourth proportional to 488.86, 731.91 and 390.43 is: 584.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    488.86 : 731.91 = 390.43 : x
  2. Step 2: Convert to fraction form
    488.86/731.91 = 390.43/x
  3. Step 3: Cross multiply
    488.86x = 731.91 × 390.43
  4. Step 4: Simplify right side
    488.86x = 285,759.62
  5. Step 5: Solve for x
    x = 285,759.62/488.86
  6. Step 6: Final answer
    x = 584.54

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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.