Home / 1,555.38-2,143.62-1,261.35

Finding the Fourth Proportional to 1,555.38, 2,143.62 and 1,261.35

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Solution

The fourth proportional to 1,555.38, 2,143.62 and 1,261.35 is: 1,738.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,555.38 : 2,143.62 = 1,261.35 : x
  2. Step 2: Convert to fraction form
    1,555.38/2,143.62 = 1,261.35/x
  3. Step 3: Cross multiply
    1,555.38x = 2,143.62 × 1,261.35
  4. Step 4: Simplify right side
    1,555.38x = 2,703,855.09
  5. Step 5: Solve for x
    x = 2,703,855.09/1,555.38
  6. Step 6: Final answer
    x = 1,738.39

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Half scale
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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.