Home / 1,261.23-1,739.25-1,138.17

Finding the Fourth Proportional to 1,261.23, 1,739.25 and 1,138.17

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Solution

The fourth proportional to 1,261.23, 1,739.25 and 1,138.17 is: 1,569.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,261.23 : 1,739.25 = 1,138.17 : x
  2. Step 2: Convert to fraction form
    1,261.23/1,739.25 = 1,138.17/x
  3. Step 3: Cross multiply
    1,261.23x = 1,739.25 × 1,138.17
  4. Step 4: Simplify right side
    1,261.23x = 1,979,562.17
  5. Step 5: Solve for x
    x = 1,979,562.17/1,261.23
  6. Step 6: Final answer
    x = 1,569.55

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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.