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Finding the Fourth Proportional to 539.98, 809.98 and 215.16

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Solution

The fourth proportional to 539.98, 809.98 and 215.16 is: 322.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    539.98 : 809.98 = 215.16 : x
  2. Step 2: Convert to fraction form
    539.98/809.98 = 215.16/x
  3. Step 3: Cross multiply
    539.98x = 809.98 × 215.16
  4. Step 4: Simplify right side
    539.98x = 174,275.30
  5. Step 5: Solve for x
    x = 174,275.30/539.98
  6. Step 6: Final answer
    x = 322.74

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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.