Home / 3,131.20-4,696.80-1,281.10

Finding the Fourth Proportional to 3,131.20, 4,696.80 and 1,281.10

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Solution

The fourth proportional to 3,131.20, 4,696.80 and 1,281.10 is: 1,921.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,131.20 : 4,696.80 = 1,281.10 : x
  2. Step 2: Convert to fraction form
    3,131.20/4,696.80 = 1,281.10/x
  3. Step 3: Cross multiply
    3,131.20x = 4,696.80 × 1,281.10
  4. Step 4: Simplify right side
    3,131.20x = 6,017,070.48
  5. Step 5: Solve for x
    x = 6,017,070.48/3,131.20
  6. Step 6: Final answer
    x = 1,921.65

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Double scale
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Similar ratio
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1.5x scale

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.