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Finding the Fourth Proportional to 663.30, 990.05 and 622.26

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Solution

The fourth proportional to 663.30, 990.05 and 622.26 is: 928.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.30 : 990.05 = 622.26 : x
  2. Step 2: Convert to fraction form
    663.30/990.05 = 622.26/x
  3. Step 3: Cross multiply
    663.30x = 990.05 × 622.26
  4. Step 4: Simplify right side
    663.30x = 616,065.40
  5. Step 5: Solve for x
    x = 616,065.40/663.30
  6. Step 6: Final answer
    x = 928.79

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.