Home / 2,147.79-3,220.29-1,415.15

Finding the Fourth Proportional to 2,147.79, 3,220.29 and 1,415.15

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Solution

The fourth proportional to 2,147.79, 3,220.29 and 1,415.15 is: 2,121.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,147.79 : 3,220.29 = 1,415.15 : x
  2. Step 2: Convert to fraction form
    2,147.79/3,220.29 = 1,415.15/x
  3. Step 3: Cross multiply
    2,147.79x = 3,220.29 × 1,415.15
  4. Step 4: Simplify right side
    2,147.79x = 4,557,177.29
  5. Step 5: Solve for x
    x = 4,557,177.29/2,147.79
  6. Step 6: Final answer
    x = 2,121.80

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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.