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Finding the Fourth Proportional to 667.40, 996.21 and 619.22

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Solution

The fourth proportional to 667.40, 996.21 and 619.22 is: 924.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.40 : 996.21 = 619.22 : x
  2. Step 2: Convert to fraction form
    667.40/996.21 = 619.22/x
  3. Step 3: Cross multiply
    667.40x = 996.21 × 619.22
  4. Step 4: Simplify right side
    667.40x = 616,868.18
  5. Step 5: Solve for x
    x = 616,868.18/667.40
  6. Step 6: Final answer
    x = 924.29

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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.