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Finding the Fourth Proportional to 3,660.66, 5,489.55 and 1,320.21

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Solution

The fourth proportional to 3,660.66, 5,489.55 and 1,320.21 is: 1,979.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,660.66 : 5,489.55 = 1,320.21 : x
  2. Step 2: Convert to fraction form
    3,660.66/5,489.55 = 1,320.21/x
  3. Step 3: Cross multiply
    3,660.66x = 5,489.55 × 1,320.21
  4. Step 4: Simplify right side
    3,660.66x = 7,247,358.81
  5. Step 5: Solve for x
    x = 7,247,358.81/3,660.66
  6. Step 6: Final answer
    x = 1,979.80

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.