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Finding the Fourth Proportional to 1,486.75, 2,049.78 and 1,220.20

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Solution

The fourth proportional to 1,486.75, 2,049.78 and 1,220.20 is: 1,682.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,486.75 : 2,049.78 = 1,220.20 : x
  2. Step 2: Convert to fraction form
    1,486.75/2,049.78 = 1,220.20/x
  3. Step 3: Cross multiply
    1,486.75x = 2,049.78 × 1,220.20
  4. Step 4: Simplify right side
    1,486.75x = 2,501,141.56
  5. Step 5: Solve for x
    x = 2,501,141.56/1,486.75
  6. Step 6: Final answer
    x = 1,682.29

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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.