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Finding the Fourth Proportional to 1,647.20, 2,471.20 and 551.70

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Solution

The fourth proportional to 1,647.20, 2,471.20 and 551.70 is: 827.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,647.20 : 2,471.20 = 551.70 : x
  2. Step 2: Convert to fraction form
    1,647.20/2,471.20 = 551.70/x
  3. Step 3: Cross multiply
    1,647.20x = 2,471.20 × 551.70
  4. Step 4: Simplify right side
    1,647.20x = 1,363,361.04
  5. Step 5: Solve for x
    x = 1,363,361.04/1,647.20
  6. Step 6: Final answer
    x = 827.68

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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.