Home / 3,111.19-4,291.57-1,931.42

Finding the Fourth Proportional to 3,111.19, 4,291.57 and 1,931.42

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Solution

The fourth proportional to 3,111.19, 4,291.57 and 1,931.42 is: 2,664.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,111.19 : 4,291.57 = 1,931.42 : x
  2. Step 2: Convert to fraction form
    3,111.19/4,291.57 = 1,931.42/x
  3. Step 3: Cross multiply
    3,111.19x = 4,291.57 × 1,931.42
  4. Step 4: Simplify right side
    3,111.19x = 8,288,824.13
  5. Step 5: Solve for x
    x = 8,288,824.13/3,111.19
  6. Step 6: Final answer
    x = 2,664.20

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Half scale
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Double scale
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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.