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Finding the Fourth Proportional to 538.49, 742.86 and 405.47

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Solution

The fourth proportional to 538.49, 742.86 and 405.47 is: 559.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    538.49 : 742.86 = 405.47 : x
  2. Step 2: Convert to fraction form
    538.49/742.86 = 405.47/x
  3. Step 3: Cross multiply
    538.49x = 742.86 × 405.47
  4. Step 4: Simplify right side
    538.49x = 301,203.73
  5. Step 5: Solve for x
    x = 301,203.73/538.49
  6. Step 6: Final answer
    x = 559.35

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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.