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Finding the Fourth Proportional to 579.86, 800.19 and 317.87

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Solution

The fourth proportional to 579.86, 800.19 and 317.87 is: 438.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    579.86 : 800.19 = 317.87 : x
  2. Step 2: Convert to fraction form
    579.86/800.19 = 317.87/x
  3. Step 3: Cross multiply
    579.86x = 800.19 × 317.87
  4. Step 4: Simplify right side
    579.86x = 254,352.39
  5. Step 5: Solve for x
    x = 254,352.39/579.86
  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.