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Finding the Fourth Proportional to 579.89, 800.21 and 317.85

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Solution

The fourth proportional to 579.89, 800.21 and 317.85 is: 438.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    579.89 : 800.21 = 317.85 : x
  2. Step 2: Convert to fraction form
    579.89/800.21 = 317.85/x
  3. Step 3: Cross multiply
    579.89x = 800.21 × 317.85
  4. Step 4: Simplify right side
    579.89x = 254,345.16
  5. Step 5: Solve for x
    x = 254,345.16/579.89
  6. Step 6: Final answer
    x = 438.61

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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.