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Finding the Fourth Proportional to 538.95, 743.63 and 391.33

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Solution

The fourth proportional to 538.95, 743.63 and 391.33 is: 539.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    538.95 : 743.63 = 391.33 : x
  2. Step 2: Convert to fraction form
    538.95/743.63 = 391.33/x
  3. Step 3: Cross multiply
    538.95x = 743.63 × 391.33
  4. Step 4: Simplify right side
    538.95x = 291,005.90
  5. Step 5: Solve for x
    x = 291,005.90/538.95
  6. Step 6: Final answer
    x = 539.95

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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.