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Finding the Fourth Proportional to 539.52, 808.79 and 215.12

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Solution

The fourth proportional to 539.52, 808.79 and 215.12 is: 322.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    539.52 : 808.79 = 215.12 : x
  2. Step 2: Convert to fraction form
    539.52/808.79 = 215.12/x
  3. Step 3: Cross multiply
    539.52x = 808.79 × 215.12
  4. Step 4: Simplify right side
    539.52x = 173,981.79
  5. Step 5: Solve for x
    x = 173,981.79/539.52
  6. Step 6: Final answer
    x = 322.48

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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.