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Finding the Fourth Proportional to 653.21, 979.64 and 220.36

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Solution

The fourth proportional to 653.21, 979.64 and 220.36 is: 330.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    653.21 : 979.64 = 220.36 : x
  2. Step 2: Convert to fraction form
    653.21/979.64 = 220.36/x
  3. Step 3: Cross multiply
    653.21x = 979.64 × 220.36
  4. Step 4: Simplify right side
    653.21x = 215,868.57
  5. Step 5: Solve for x
    x = 215,868.57/653.21
  6. Step 6: Final answer
    x = 330.48

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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.