Home / 1,988.66-2,745.61-1,280.76

Finding the Fourth Proportional to 1,988.66, 2,745.61 and 1,280.76

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Solution

The fourth proportional to 1,988.66, 2,745.61 and 1,280.76 is: 1,768.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,988.66 : 2,745.61 = 1,280.76 : x
  2. Step 2: Convert to fraction form
    1,988.66/2,745.61 = 1,280.76/x
  3. Step 3: Cross multiply
    1,988.66x = 2,745.61 × 1,280.76
  4. Step 4: Simplify right side
    1,988.66x = 3,516,467.46
  5. Step 5: Solve for x
    x = 3,516,467.46/1,988.66
  6. Step 6: Final answer
    x = 1,768.26

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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.