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Finding the Fourth Proportional to 715.31, 1,072.97 and 228.70

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Solution

The fourth proportional to 715.31, 1,072.97 and 228.70 is: 343.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.31 : 1,072.97 = 228.70 : x
  2. Step 2: Convert to fraction form
    715.31/1,072.97 = 228.70/x
  3. Step 3: Cross multiply
    715.31x = 1,072.97 × 228.70
  4. Step 4: Simplify right side
    715.31x = 245,388.24
  5. Step 5: Solve for x
    x = 245,388.24/715.31
  6. Step 6: Final answer
    x = 343.05

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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.