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Finding the Fourth Proportional to 653.56, 980.40 and 220.76

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Solution

The fourth proportional to 653.56, 980.40 and 220.76 is: 331.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    653.56 : 980.40 = 220.76 : x
  2. Step 2: Convert to fraction form
    653.56/980.40 = 220.76/x
  3. Step 3: Cross multiply
    653.56x = 980.40 × 220.76
  4. Step 4: Simplify right side
    653.56x = 216,433.10
  5. Step 5: Solve for x
    x = 216,433.10/653.56
  6. Step 6: Final answer
    x = 331.16

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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.