Home / 2,131.12-2,940.70-1,186.76

Finding the Fourth Proportional to 2,131.12, 2,940.70 and 1,186.76

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Solution

The fourth proportional to 2,131.12, 2,940.70 and 1,186.76 is: 1,637.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,131.12 : 2,940.70 = 1,186.76 : x
  2. Step 2: Convert to fraction form
    2,131.12/2,940.70 = 1,186.76/x
  3. Step 3: Cross multiply
    2,131.12x = 2,940.70 × 1,186.76
  4. Step 4: Simplify right side
    2,131.12x = 3,489,905.13
  5. Step 5: Solve for x
    x = 3,489,905.13/2,131.12
  6. Step 6: Final answer
    x = 1,637.59

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Half scale
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Double scale
Find fourth proportional to 2,132.12, 2,942.08 and 1,187.76
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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.