Home / 1,986.60-2,987.10-1,669.80

Finding the Fourth Proportional to 1,986.60, 2,987.10 and 1,669.80

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Solution

The fourth proportional to 1,986.60, 2,987.10 and 1,669.80 is: 2,510.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,986.60 : 2,987.10 = 1,669.80 : x
  2. Step 2: Convert to fraction form
    1,986.60/2,987.10 = 1,669.80/x
  3. Step 3: Cross multiply
    1,986.60x = 2,987.10 × 1,669.80
  4. Step 4: Simplify right side
    1,986.60x = 4,987,859.58
  5. Step 5: Solve for x
    x = 4,987,859.58/1,986.60
  6. Step 6: Final answer
    x = 2,510.75

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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.