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Finding the Fourth Proportional to 715.35, 1,072.78 and 325.03

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Solution

The fourth proportional to 715.35, 1,072.78 and 325.03 is: 487.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.35 : 1,072.78 = 325.03 : x
  2. Step 2: Convert to fraction form
    715.35/1,072.78 = 325.03/x
  3. Step 3: Cross multiply
    715.35x = 1,072.78 × 325.03
  4. Step 4: Simplify right side
    715.35x = 348,685.68
  5. Step 5: Solve for x
    x = 348,685.68/715.35
  6. Step 6: Final answer
    x = 487.43

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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.