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Finding the Fourth Proportional to 538.98, 743.48 and 391.44

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Solution

The fourth proportional to 538.98, 743.48 and 391.44 is: 539.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    538.98 : 743.48 = 391.44 : x
  2. Step 2: Convert to fraction form
    538.98/743.48 = 391.44/x
  3. Step 3: Cross multiply
    538.98x = 743.48 × 391.44
  4. Step 4: Simplify right side
    538.98x = 291,027.81
  5. Step 5: Solve for x
    x = 291,027.81/538.98
  6. Step 6: Final answer
    x = 539.96

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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.