Home / 2,164.87-2,987.40-1,220.82

Finding the Fourth Proportional to 2,164.87, 2,987.40 and 1,220.82

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Solution

The fourth proportional to 2,164.87, 2,987.40 and 1,220.82 is: 1,684.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,164.87 : 2,987.40 = 1,220.82 : x
  2. Step 2: Convert to fraction form
    2,164.87/2,987.40 = 1,220.82/x
  3. Step 3: Cross multiply
    2,164.87x = 2,987.40 × 1,220.82
  4. Step 4: Simplify right side
    2,164.87x = 3,647,077.67
  5. Step 5: Solve for x
    x = 3,647,077.67/2,164.87
  6. Step 6: Final answer
    x = 1,684.66

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.