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Finding the Fourth Proportional to 958.88, 1,322.36 and 639.72

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Solution

The fourth proportional to 958.88, 1,322.36 and 639.72 is: 882.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    958.88 : 1,322.36 = 639.72 : x
  2. Step 2: Convert to fraction form
    958.88/1,322.36 = 639.72/x
  3. Step 3: Cross multiply
    958.88x = 1,322.36 × 639.72
  4. Step 4: Simplify right side
    958.88x = 845,940.14
  5. Step 5: Solve for x
    x = 845,940.14/958.88
  6. Step 6: Final answer
    x = 882.22

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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.