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Finding the Fourth Proportional to 539.43, 744.70 and 421.15

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Solution

The fourth proportional to 539.43, 744.70 and 421.15 is: 581.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    539.43 : 744.70 = 421.15 : x
  2. Step 2: Convert to fraction form
    539.43/744.70 = 421.15/x
  3. Step 3: Cross multiply
    539.43x = 744.70 × 421.15
  4. Step 4: Simplify right side
    539.43x = 313,628.30
  5. Step 5: Solve for x
    x = 313,628.30/539.43
  6. Step 6: Final answer
    x = 581.41

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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.