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Finding the Fourth Proportional to 943.90, 1,301.21 and 663.29

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Solution

The fourth proportional to 943.90, 1,301.21 and 663.29 is: 914.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    943.90 : 1,301.21 = 663.29 : x
  2. Step 2: Convert to fraction form
    943.90/1,301.21 = 663.29/x
  3. Step 3: Cross multiply
    943.90x = 1,301.21 × 663.29
  4. Step 4: Simplify right side
    943.90x = 863,079.58
  5. Step 5: Solve for x
    x = 863,079.58/943.90
  6. Step 6: Final answer
    x = 914.38

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.