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Finding the Fourth Proportional to 958.63, 1,324.32 and 643.79

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Solution

The fourth proportional to 958.63, 1,324.32 and 643.79 is: 889.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    958.63 : 1,324.32 = 643.79 : x
  2. Step 2: Convert to fraction form
    958.63/1,324.32 = 643.79/x
  3. Step 3: Cross multiply
    958.63x = 1,324.32 × 643.79
  4. Step 4: Simplify right side
    958.63x = 852,587.28
  5. Step 5: Solve for x
    x = 852,587.28/958.63
  6. Step 6: Final answer
    x = 889.38

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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.