Home / 3,109.04-4,287.36-1,988.72

Finding the Fourth Proportional to 3,109.04, 4,287.36 and 1,988.72

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Solution

The fourth proportional to 3,109.04, 4,287.36 and 1,988.72 is: 2,742.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,109.04 : 4,287.36 = 1,988.72 : x
  2. Step 2: Convert to fraction form
    3,109.04/4,287.36 = 1,988.72/x
  3. Step 3: Cross multiply
    3,109.04x = 4,287.36 × 1,988.72
  4. Step 4: Simplify right side
    3,109.04x = 8,526,358.58
  5. Step 5: Solve for x
    x = 8,526,358.58/3,109.04
  6. Step 6: Final answer
    x = 2,742.44

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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.