Home / 1,261.71-1,740.56-1,086.75

Finding the Fourth Proportional to 1,261.71, 1,740.56 and 1,086.75

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Solution

The fourth proportional to 1,261.71, 1,740.56 and 1,086.75 is: 1,499.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,261.71 : 1,740.56 = 1,086.75 : x
  2. Step 2: Convert to fraction form
    1,261.71/1,740.56 = 1,086.75/x
  3. Step 3: Cross multiply
    1,261.71x = 1,740.56 × 1,086.75
  4. Step 4: Simplify right side
    1,261.71x = 1,891,548.15
  5. Step 5: Solve for x
    x = 1,891,548.15/1,261.71
  6. Step 6: Final answer
    x = 1,499.19

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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.