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Finding the Fourth Proportional to 539.88, 809.34 and 215.07

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Solution

The fourth proportional to 539.88, 809.34 and 215.07 is: 322.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    539.88 : 809.34 = 215.07 : x
  2. Step 2: Convert to fraction form
    539.88/809.34 = 215.07/x
  3. Step 3: Cross multiply
    539.88x = 809.34 × 215.07
  4. Step 4: Simplify right side
    539.88x = 174,064.75
  5. Step 5: Solve for x
    x = 174,064.75/539.88
  6. Step 6: Final answer
    x = 322.41

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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.