Home / 5,148.78-7,720.88-1,638.13

Finding the Fourth Proportional to 5,148.78, 7,720.88 and 1,638.13

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Solution

The fourth proportional to 5,148.78, 7,720.88 and 1,638.13 is: 2,456.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,148.78 : 7,720.88 = 1,638.13 : x
  2. Step 2: Convert to fraction form
    5,148.78/7,720.88 = 1,638.13/x
  3. Step 3: Cross multiply
    5,148.78x = 7,720.88 × 1,638.13
  4. Step 4: Simplify right side
    5,148.78x = 12,647,777.66
  5. Step 5: Solve for x
    x = 12,647,777.66/5,148.78
  6. Step 6: Final answer
    x = 2,456.46

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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.