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Finding the Fourth Proportional to 943.16, 1,302.20 and 721.72

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Solution

The fourth proportional to 943.16, 1,302.20 and 721.72 is: 996.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    943.16 : 1,302.20 = 721.72 : x
  2. Step 2: Convert to fraction form
    943.16/1,302.20 = 721.72/x
  3. Step 3: Cross multiply
    943.16x = 1,302.20 × 721.72
  4. Step 4: Simplify right side
    943.16x = 939,822.33
  5. Step 5: Solve for x
    x = 939,822.33/943.16
  6. Step 6: Final answer
    x = 996.47

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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.