Home / 5,147.12-7,721.81-1,638.20

Finding the Fourth Proportional to 5,147.12, 7,721.81 and 1,638.20

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Solution

The fourth proportional to 5,147.12, 7,721.81 and 1,638.20 is: 2,457.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,147.12 : 7,721.81 = 1,638.20 : x
  2. Step 2: Convert to fraction form
    5,147.12/7,721.81 = 1,638.20/x
  3. Step 3: Cross multiply
    5,147.12x = 7,721.81 × 1,638.20
  4. Step 4: Simplify right side
    5,147.12x = 12,649,822.34
  5. Step 5: Solve for x
    x = 12,649,822.34/5,147.12
  6. Step 6: Final answer
    x = 2,457.65

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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.