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Finding the Fourth Proportional to 1,318.94, 1,820.23 and 729.46

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Solution

The fourth proportional to 1,318.94, 1,820.23 and 729.46 is: 1,006.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,318.94 : 1,820.23 = 729.46 : x
  2. Step 2: Convert to fraction form
    1,318.94/1,820.23 = 729.46/x
  3. Step 3: Cross multiply
    1,318.94x = 1,820.23 × 729.46
  4. Step 4: Simplify right side
    1,318.94x = 1,327,785.43
  5. Step 5: Solve for x
    x = 1,327,785.43/1,318.94
  6. Step 6: Final answer
    x = 1,006.71

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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.