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Finding the Fourth Proportional to 540.26, 809.95 and 215.31

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Solution

The fourth proportional to 540.26, 809.95 and 215.31 is: 322.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    540.26 : 809.95 = 215.31 : x
  2. Step 2: Convert to fraction form
    540.26/809.95 = 215.31/x
  3. Step 3: Cross multiply
    540.26x = 809.95 × 215.31
  4. Step 4: Simplify right side
    540.26x = 174,390.33
  5. Step 5: Solve for x
    x = 174,390.33/540.26
  6. Step 6: Final answer
    x = 322.79

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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.