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Finding the Fourth Proportional to 539.82, 809.90 and 215.01

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Solution

The fourth proportional to 539.82, 809.90 and 215.01 is: 322.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    539.82 : 809.90 = 215.01 : x
  2. Step 2: Convert to fraction form
    539.82/809.90 = 215.01/x
  3. Step 3: Cross multiply
    539.82x = 809.90 × 215.01
  4. Step 4: Simplify right side
    539.82x = 174,136.60
  5. Step 5: Solve for x
    x = 174,136.60/539.82
  6. Step 6: Final answer
    x = 322.58

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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.