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Finding the Fourth Proportional to 539.78, 744.36 and 343.40

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Solution

The fourth proportional to 539.78, 744.36 and 343.40 is: 473.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    539.78 : 744.36 = 343.40 : x
  2. Step 2: Convert to fraction form
    539.78/744.36 = 343.40/x
  3. Step 3: Cross multiply
    539.78x = 744.36 × 343.40
  4. Step 4: Simplify right side
    539.78x = 255,613.22
  5. Step 5: Solve for x
    x = 255,613.22/539.78
  6. Step 6: Final answer
    x = 473.55

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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.