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Finding the Fourth Proportional to 653.88, 980.10 and 220.71

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Solution

The fourth proportional to 653.88, 980.10 and 220.71 is: 330.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    653.88 : 980.10 = 220.71 : x
  2. Step 2: Convert to fraction form
    653.88/980.10 = 220.71/x
  3. Step 3: Cross multiply
    653.88x = 980.10 × 220.71
  4. Step 4: Simplify right side
    653.88x = 216,317.87
  5. Step 5: Solve for x
    x = 216,317.87/653.88
  6. Step 6: Final answer
    x = 330.82

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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.