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Finding the Fourth Proportional to 653.42, 980.05 and 220.57

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Solution

The fourth proportional to 653.42, 980.05 and 220.57 is: 330.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    653.42 : 980.05 = 220.57 : x
  2. Step 2: Convert to fraction form
    653.42/980.05 = 220.57/x
  3. Step 3: Cross multiply
    653.42x = 980.05 × 220.57
  4. Step 4: Simplify right side
    653.42x = 216,172.55
  5. Step 5: Solve for x
    x = 216,172.55/653.42
  6. Step 6: Final answer
    x = 330.83

Related Problems

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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.