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Finding the Fourth Proportional to 1,647.42, 2,470.91 and 551.76

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Solution

The fourth proportional to 1,647.42, 2,470.91 and 551.76 is: 827.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,647.42 : 2,470.91 = 551.76 : x
  2. Step 2: Convert to fraction form
    1,647.42/2,470.91 = 551.76/x
  3. Step 3: Cross multiply
    1,647.42x = 2,470.91 × 551.76
  4. Step 4: Simplify right side
    1,647.42x = 1,363,346.54
  5. Step 5: Solve for x
    x = 1,363,346.54/1,647.42
  6. Step 6: Final answer
    x = 827.56

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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.