Home / 3,109.19-4,290.17-1,931.85

Finding the Fourth Proportional to 3,109.19, 4,290.17 and 1,931.85

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Solution

The fourth proportional to 3,109.19, 4,290.17 and 1,931.85 is: 2,665.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,109.19 : 4,290.17 = 1,931.85 : x
  2. Step 2: Convert to fraction form
    3,109.19/4,290.17 = 1,931.85/x
  3. Step 3: Cross multiply
    3,109.19x = 4,290.17 × 1,931.85
  4. Step 4: Simplify right side
    3,109.19x = 8,287,955.26
  5. Step 5: Solve for x
    x = 8,287,955.26/3,109.19
  6. Step 6: Final answer
    x = 2,665.64

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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.