Home / 4,212.80-6,319.20-1,291.10

Finding the Fourth Proportional to 4,212.80, 6,319.20 and 1,291.10

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Solution

The fourth proportional to 4,212.80, 6,319.20 and 1,291.10 is: 1,936.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,212.80 : 6,319.20 = 1,291.10 : x
  2. Step 2: Convert to fraction form
    4,212.80/6,319.20 = 1,291.10/x
  3. Step 3: Cross multiply
    4,212.80x = 6,319.20 × 1,291.10
  4. Step 4: Simplify right side
    4,212.80x = 8,158,719.12
  5. Step 5: Solve for x
    x = 8,158,719.12/4,212.80
  6. Step 6: Final answer
    x = 1,936.65

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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.