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Finding the Fourth Proportional to 539.83, 810.21 and 215.42

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Solution

The fourth proportional to 539.83, 810.21 and 215.42 is: 323.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    539.83 : 810.21 = 215.42 : x
  2. Step 2: Convert to fraction form
    539.83/810.21 = 215.42/x
  3. Step 3: Cross multiply
    539.83x = 810.21 × 215.42
  4. Step 4: Simplify right side
    539.83x = 174,535.44
  5. Step 5: Solve for x
    x = 174,535.44/539.83
  6. Step 6: Final answer
    x = 323.32

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.