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Finding the Fourth Proportional to 491.98, 679 and 317.83

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Solution

The fourth proportional to 491.98, 679 and 317.83 is: 438.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    491.98 : 679 = 317.83 : x
  2. Step 2: Convert to fraction form
    491.98/679 = 317.83/x
  3. Step 3: Cross multiply
    491.98x = 679 × 317.83
  4. Step 4: Simplify right side
    491.98x = 215,806.57
  5. Step 5: Solve for x
    x = 215,806.57/491.98
  6. Step 6: Final answer
    x = 438.65

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.