Home / 1,511.47-2,087-1,218.12

Finding the Fourth Proportional to 1,511.47, 2,087 and 1,218.12

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Solution

The fourth proportional to 1,511.47, 2,087 and 1,218.12 is: 1,681.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,511.47 : 2,087 = 1,218.12 : x
  2. Step 2: Convert to fraction form
    1,511.47/2,087 = 1,218.12/x
  3. Step 3: Cross multiply
    1,511.47x = 2,087 × 1,218.12
  4. Step 4: Simplify right side
    1,511.47x = 2,542,216.44
  5. Step 5: Solve for x
    x = 2,542,216.44/1,511.47
  6. Step 6: Final answer
    x = 1,681.95

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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.