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Finding the Fourth Proportional to 872.44, 1,309.30 and 439.63

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Solution

The fourth proportional to 872.44, 1,309.30 and 439.63 is: 659.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.44 : 1,309.30 = 439.63 : x
  2. Step 2: Convert to fraction form
    872.44/1,309.30 = 439.63/x
  3. Step 3: Cross multiply
    872.44x = 1,309.30 × 439.63
  4. Step 4: Simplify right side
    872.44x = 575,603.19
  5. Step 5: Solve for x
    x = 575,603.19/872.44
  6. Step 6: Final answer
    x = 659.76

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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.