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Finding the Fourth Proportional to 653.74, 980.43 and 220.66

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Solution

The fourth proportional to 653.74, 980.43 and 220.66 is: 330.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    653.74 : 980.43 = 220.66 : x
  2. Step 2: Convert to fraction form
    653.74/980.43 = 220.66/x
  3. Step 3: Cross multiply
    653.74x = 980.43 × 220.66
  4. Step 4: Simplify right side
    653.74x = 216,341.68
  5. Step 5: Solve for x
    x = 216,341.68/653.74
  6. Step 6: Final answer
    x = 330.93

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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.