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Finding the Fourth Proportional to 539.20, 745.14 and 407.98

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Solution

The fourth proportional to 539.20, 745.14 and 407.98 is: 563.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    539.20 : 745.14 = 407.98 : x
  2. Step 2: Convert to fraction form
    539.20/745.14 = 407.98/x
  3. Step 3: Cross multiply
    539.20x = 745.14 × 407.98
  4. Step 4: Simplify right side
    539.20x = 304,002.22
  5. Step 5: Solve for x
    x = 304,002.22/539.20
  6. Step 6: Final answer
    x = 563.80

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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.