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Finding the Fourth Proportional to 872.64, 1,303.97 and 663.25

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Solution

The fourth proportional to 872.64, 1,303.97 and 663.25 is: 991.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.64 : 1,303.97 = 663.25 : x
  2. Step 2: Convert to fraction form
    872.64/1,303.97 = 663.25/x
  3. Step 3: Cross multiply
    872.64x = 1,303.97 × 663.25
  4. Step 4: Simplify right side
    872.64x = 864,859.30
  5. Step 5: Solve for x
    x = 864,859.30/872.64
  6. Step 6: Final answer
    x = 991.09

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.