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Finding the Fourth Proportional to 882.72, 1,322.66 and 639.38

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Solution

The fourth proportional to 882.72, 1,322.66 and 639.38 is: 958.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    882.72 : 1,322.66 = 639.38 : x
  2. Step 2: Convert to fraction form
    882.72/1,322.66 = 639.38/x
  3. Step 3: Cross multiply
    882.72x = 1,322.66 × 639.38
  4. Step 4: Simplify right side
    882.72x = 845,687.26
  5. Step 5: Solve for x
    x = 845,687.26/882.72
  6. Step 6: Final answer
    x = 958.05

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.