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Finding the Fourth Proportional to 653.74, 980.28 and 220.76

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Solution

The fourth proportional to 653.74, 980.28 and 220.76 is: 331.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    653.74 : 980.28 = 220.76 : x
  2. Step 2: Convert to fraction form
    653.74/980.28 = 220.76/x
  3. Step 3: Cross multiply
    653.74x = 980.28 × 220.76
  4. Step 4: Simplify right side
    653.74x = 216,406.61
  5. Step 5: Solve for x
    x = 216,406.61/653.74
  6. Step 6: Final answer
    x = 331.03

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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.