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Finding the Fourth Proportional to 539.76, 809.61 and 210.64

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Solution

The fourth proportional to 539.76, 809.61 and 210.64 is: 315.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    539.76 : 809.61 = 210.64 : x
  2. Step 2: Convert to fraction form
    539.76/809.61 = 210.64/x
  3. Step 3: Cross multiply
    539.76x = 809.61 × 210.64
  4. Step 4: Simplify right side
    539.76x = 170,535.25
  5. Step 5: Solve for x
    x = 170,535.25/539.76
  6. Step 6: Final answer
    x = 315.95

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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.