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Finding the Fourth Proportional to 538.66, 744.03 and 398.98

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Solution

The fourth proportional to 538.66, 744.03 and 398.98 is: 551.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    538.66 : 744.03 = 398.98 : x
  2. Step 2: Convert to fraction form
    538.66/744.03 = 398.98/x
  3. Step 3: Cross multiply
    538.66x = 744.03 × 398.98
  4. Step 4: Simplify right side
    538.66x = 296,853.09
  5. Step 5: Solve for x
    x = 296,853.09/538.66
  6. Step 6: Final answer
    x = 551.10

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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.