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Finding the Fourth Proportional to 539.67, 809.79 and 215.04

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Solution

The fourth proportional to 539.67, 809.79 and 215.04 is: 322.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    539.67 : 809.79 = 215.04 : x
  2. Step 2: Convert to fraction form
    539.67/809.79 = 215.04/x
  3. Step 3: Cross multiply
    539.67x = 809.79 × 215.04
  4. Step 4: Simplify right side
    539.67x = 174,137.24
  5. Step 5: Solve for x
    x = 174,137.24/539.67
  6. Step 6: Final answer
    x = 322.67

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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.