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Finding the Fourth Proportional to 574.19, 792.38 and 312.21

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Solution

The fourth proportional to 574.19, 792.38 and 312.21 is: 430.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    574.19 : 792.38 = 312.21 : x
  2. Step 2: Convert to fraction form
    574.19/792.38 = 312.21/x
  3. Step 3: Cross multiply
    574.19x = 792.38 × 312.21
  4. Step 4: Simplify right side
    574.19x = 247,388.96
  5. Step 5: Solve for x
    x = 247,388.96/574.19
  6. Step 6: Final answer
    x = 430.85

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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.