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Finding the Fourth Proportional to 379.88, 523.56 and 317.72

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Solution

The fourth proportional to 379.88, 523.56 and 317.72 is: 437.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    379.88 : 523.56 = 317.72 : x
  2. Step 2: Convert to fraction form
    379.88/523.56 = 317.72/x
  3. Step 3: Cross multiply
    379.88x = 523.56 × 317.72
  4. Step 4: Simplify right side
    379.88x = 166,345.48
  5. Step 5: Solve for x
    x = 166,345.48/379.88
  6. Step 6: Final answer
    x = 437.89

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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.