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Finding the Fourth Proportional to 653.64, 979.76 and 220.64

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Solution

The fourth proportional to 653.64, 979.76 and 220.64 is: 330.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    653.64 : 979.76 = 220.64 : x
  2. Step 2: Convert to fraction form
    653.64/979.76 = 220.64/x
  3. Step 3: Cross multiply
    653.64x = 979.76 × 220.64
  4. Step 4: Simplify right side
    653.64x = 216,174.25
  5. Step 5: Solve for x
    x = 216,174.25/653.64
  6. Step 6: Final answer
    x = 330.72

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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.