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Finding the Fourth Proportional to 1,647.18, 2,470.90 and 551.55

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Solution

The fourth proportional to 1,647.18, 2,470.90 and 551.55 is: 827.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,647.18 : 2,470.90 = 551.55 : x
  2. Step 2: Convert to fraction form
    1,647.18/2,470.90 = 551.55/x
  3. Step 3: Cross multiply
    1,647.18x = 2,470.90 × 551.55
  4. Step 4: Simplify right side
    1,647.18x = 1,362,809.78
  5. Step 5: Solve for x
    x = 1,362,809.78/1,647.18
  6. Step 6: Final answer
    x = 827.36

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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.