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Finding the Fourth Proportional to 539.82, 745.10 and 318.85

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Solution

The fourth proportional to 539.82, 745.10 and 318.85 is: 440.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    539.82 : 745.10 = 318.85 : x
  2. Step 2: Convert to fraction form
    539.82/745.10 = 318.85/x
  3. Step 3: Cross multiply
    539.82x = 745.10 × 318.85
  4. Step 4: Simplify right side
    539.82x = 237,574.07
  5. Step 5: Solve for x
    x = 237,574.07/539.82
  6. Step 6: Final answer
    x = 440.10

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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.