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Finding the Fourth Proportional to 814.17, 1,221.86 and 653.79

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Solution

The fourth proportional to 814.17, 1,221.86 and 653.79 is: 981.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    814.17 : 1,221.86 = 653.79 : x
  2. Step 2: Convert to fraction form
    814.17/1,221.86 = 653.79/x
  3. Step 3: Cross multiply
    814.17x = 1,221.86 × 653.79
  4. Step 4: Simplify right side
    814.17x = 798,841.48
  5. Step 5: Solve for x
    x = 798,841.48/814.17
  6. Step 6: Final answer
    x = 981.17

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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.