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Finding the Fourth Proportional to 872.97, 1,309.64 and 434.45

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Solution

The fourth proportional to 872.97, 1,309.64 and 434.45 is: 651.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.97 : 1,309.64 = 434.45 : x
  2. Step 2: Convert to fraction form
    872.97/1,309.64 = 434.45/x
  3. Step 3: Cross multiply
    872.97x = 1,309.64 × 434.45
  4. Step 4: Simplify right side
    872.97x = 568,977.46
  5. Step 5: Solve for x
    x = 568,977.46/872.97
  6. Step 6: Final answer
    x = 651.77

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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.