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Finding the Third Proportional to 358.50 and 392

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Solution

The third proportional to 358.50 and 392 is: 428.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    358.50 : 392 = 392 : x
  2. Step 2: Convert to fraction form
    358.50/392 = 392/x
  3. Step 3: Cross multiply
    358.50x = 392 × 392
  4. Step 4: Simplify right side
    358.50x = 153,664
  5. Step 5: Solve for x
    x = 153,664/358.50
  6. Step 6: Final answer
    x = 428.63

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These problems maintain the same ratio (1.09) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.