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Finding the Fourth Proportional to 491.79, 736.31 and 398.69

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Solution

The fourth proportional to 491.79, 736.31 and 398.69 is: 596.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    491.79 : 736.31 = 398.69 : x
  2. Step 2: Convert to fraction form
    491.79/736.31 = 398.69/x
  3. Step 3: Cross multiply
    491.79x = 736.31 × 398.69
  4. Step 4: Simplify right side
    491.79x = 293,556.75
  5. Step 5: Solve for x
    x = 293,556.75/491.79
  6. Step 6: Final answer
    x = 596.91

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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.