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Finding the Fourth Proportional to 715.45, 1,071.36 and 349.28

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Solution

The fourth proportional to 715.45, 1,071.36 and 349.28 is: 523.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.45 : 1,071.36 = 349.28 : x
  2. Step 2: Convert to fraction form
    715.45/1,071.36 = 349.28/x
  3. Step 3: Cross multiply
    715.45x = 1,071.36 × 349.28
  4. Step 4: Simplify right side
    715.45x = 374,205.55
  5. Step 5: Solve for x
    x = 374,205.55/715.45
  6. Step 6: Final answer
    x = 523.03

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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.