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Finding the Fourth Proportional to 493.79, 739.94 and 390.65

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Solution

The fourth proportional to 493.79, 739.94 and 390.65 is: 585.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    493.79 : 739.94 = 390.65 : x
  2. Step 2: Convert to fraction form
    493.79/739.94 = 390.65/x
  3. Step 3: Cross multiply
    493.79x = 739.94 × 390.65
  4. Step 4: Simplify right side
    493.79x = 289,057.56
  5. Step 5: Solve for x
    x = 289,057.56/493.79
  6. Step 6: Final answer
    x = 585.39

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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.