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Finding the Fourth Proportional to 543.25, 749.81 and 319.29

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Solution

The fourth proportional to 543.25, 749.81 and 319.29 is: 440.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    543.25 : 749.81 = 319.29 : x
  2. Step 2: Convert to fraction form
    543.25/749.81 = 319.29/x
  3. Step 3: Cross multiply
    543.25x = 749.81 × 319.29
  4. Step 4: Simplify right side
    543.25x = 239,404.82
  5. Step 5: Solve for x
    x = 239,404.82/543.25
  6. Step 6: Final answer
    x = 440.69

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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.