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Finding the Fourth Proportional to 537.98, 742.10 and 390.44

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Solution

The fourth proportional to 537.98, 742.10 and 390.44 is: 538.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    537.98 : 742.10 = 390.44 : x
  2. Step 2: Convert to fraction form
    537.98/742.10 = 390.44/x
  3. Step 3: Cross multiply
    537.98x = 742.10 × 390.44
  4. Step 4: Simplify right side
    537.98x = 289,745.52
  5. Step 5: Solve for x
    x = 289,745.52/537.98
  6. Step 6: Final answer
    x = 538.58

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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.