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Finding the Fourth Proportional to 653.64, 980.06 and 220.70

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Solution

The fourth proportional to 653.64, 980.06 and 220.70 is: 330.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    653.64 : 980.06 = 220.70 : x
  2. Step 2: Convert to fraction form
    653.64/980.06 = 220.70/x
  3. Step 3: Cross multiply
    653.64x = 980.06 × 220.70
  4. Step 4: Simplify right side
    653.64x = 216,293.24
  5. Step 5: Solve for x
    x = 216,293.24/653.64
  6. Step 6: Final answer
    x = 330.91

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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.