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Finding the Fourth Proportional to 958.34, 1,321.17 and 643.05

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Solution

The fourth proportional to 958.34, 1,321.17 and 643.05 is: 886.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    958.34 : 1,321.17 = 643.05 : x
  2. Step 2: Convert to fraction form
    958.34/1,321.17 = 643.05/x
  3. Step 3: Cross multiply
    958.34x = 1,321.17 × 643.05
  4. Step 4: Simplify right side
    958.34x = 849,578.37
  5. Step 5: Solve for x
    x = 849,578.37/958.34
  6. Step 6: Final answer
    x = 886.52

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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.