Home / 2,113.48-3,171.30-815.80

Finding the Fourth Proportional to 2,113.48, 3,171.30 and 815.80

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Solution

The fourth proportional to 2,113.48, 3,171.30 and 815.80 is: 1,224.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,113.48 : 3,171.30 = 815.80 : x
  2. Step 2: Convert to fraction form
    2,113.48/3,171.30 = 815.80/x
  3. Step 3: Cross multiply
    2,113.48x = 3,171.30 × 815.80
  4. Step 4: Simplify right side
    2,113.48x = 2,587,146.54
  5. Step 5: Solve for x
    x = 2,587,146.54/2,113.48
  6. Step 6: Final answer
    x = 1,224.12

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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.