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Finding the Fourth Proportional to 574.50, 792.80 and 312.51

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Solution

The fourth proportional to 574.50, 792.80 and 312.51 is: 431.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    574.50 : 792.80 = 312.51 : x
  2. Step 2: Convert to fraction form
    574.50/792.80 = 312.51/x
  3. Step 3: Cross multiply
    574.50x = 792.80 × 312.51
  4. Step 4: Simplify right side
    574.50x = 247,758.71
  5. Step 5: Solve for x
    x = 247,758.71/574.50
  6. Step 6: Final answer
    x = 431.26

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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.