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Finding the Fourth Proportional to 715.21, 1,073 and 422.97

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Solution

The fourth proportional to 715.21, 1,073 and 422.97 is: 634.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.21 : 1,073 = 422.97 : x
  2. Step 2: Convert to fraction form
    715.21/1,073 = 422.97/x
  3. Step 3: Cross multiply
    715.21x = 1,073 × 422.97
  4. Step 4: Simplify right side
    715.21x = 453,846.81
  5. Step 5: Solve for x
    x = 453,846.81/715.21
  6. Step 6: Final answer
    x = 634.56

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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.