Home / 1,261.38-1,741.72-1,128.36

Finding the Fourth Proportional to 1,261.38, 1,741.72 and 1,128.36

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Solution

The fourth proportional to 1,261.38, 1,741.72 and 1,128.36 is: 1,558.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,261.38 : 1,741.72 = 1,128.36 : x
  2. Step 2: Convert to fraction form
    1,261.38/1,741.72 = 1,128.36/x
  3. Step 3: Cross multiply
    1,261.38x = 1,741.72 × 1,128.36
  4. Step 4: Simplify right side
    1,261.38x = 1,965,293.01
  5. Step 5: Solve for x
    x = 1,965,293.01/1,261.38
  6. Step 6: Final answer
    x = 1,558.05

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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.