Home / 1,420.26-2,115.44-1,330.26

Finding the Fourth Proportional to 1,420.26, 2,115.44 and 1,330.26

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Solution

The fourth proportional to 1,420.26, 2,115.44 and 1,330.26 is: 1,981.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.26 : 2,115.44 = 1,330.26 : x
  2. Step 2: Convert to fraction form
    1,420.26/2,115.44 = 1,330.26/x
  3. Step 3: Cross multiply
    1,420.26x = 2,115.44 × 1,330.26
  4. Step 4: Simplify right side
    1,420.26x = 2,814,078.56
  5. Step 5: Solve for x
    x = 2,814,078.56/1,420.26
  6. Step 6: Final answer
    x = 1,981.38

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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 (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.