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Finding the Fourth Proportional to 574.14, 792.31 and 312.15

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Solution

The fourth proportional to 574.14, 792.31 and 312.15 is: 430.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    574.14 : 792.31 = 312.15 : x
  2. Step 2: Convert to fraction form
    574.14/792.31 = 312.15/x
  3. Step 3: Cross multiply
    574.14x = 792.31 × 312.15
  4. Step 4: Simplify right side
    574.14x = 247,322.34
  5. Step 5: Solve for x
    x = 247,322.34/574.14
  6. Step 6: Final answer
    x = 430.77

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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.