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Finding the Fourth Proportional to 5,148.80, 7,721.40 and 2,682.80

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Solution

The fourth proportional to 5,148.80, 7,721.40 and 2,682.80 is: 4,023.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,148.80 : 7,721.40 = 2,682.80 : x
  2. Step 2: Convert to fraction form
    5,148.80/7,721.40 = 2,682.80/x
  3. Step 3: Cross multiply
    5,148.80x = 7,721.40 × 2,682.80
  4. Step 4: Simplify right side
    5,148.80x = 20,714,971.92
  5. Step 5: Solve for x
    x = 20,714,971.92/5,148.80
  6. Step 6: Final answer
    x = 4,023.26

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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.