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Finding the Fourth Proportional to 579.38, 799.55 and 317.40

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Solution

The fourth proportional to 579.38, 799.55 and 317.40 is: 438.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    579.38 : 799.55 = 317.40 : x
  2. Step 2: Convert to fraction form
    579.38/799.55 = 317.40/x
  3. Step 3: Cross multiply
    579.38x = 799.55 × 317.40
  4. Step 4: Simplify right side
    579.38x = 253,775.58
  5. Step 5: Solve for x
    x = 253,775.58/579.38
  6. Step 6: Final answer
    x = 438.02

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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.