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Finding the Fourth Proportional to 2,648.13, 3,972.60 and 868.64

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Solution

The fourth proportional to 2,648.13, 3,972.60 and 868.64 is: 1,303.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,648.13 : 3,972.60 = 868.64 : x
  2. Step 2: Convert to fraction form
    2,648.13/3,972.60 = 868.64/x
  3. Step 3: Cross multiply
    2,648.13x = 3,972.60 × 868.64
  4. Step 4: Simplify right side
    2,648.13x = 3,450,739.40
  5. Step 5: Solve for x
    x = 3,450,739.40/2,648.13
  6. Step 6: Final answer
    x = 1,303.09

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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.