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Finding the Third Proportional to 289.50 and 402

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Solution

The third proportional to 289.50 and 402 is: 558.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.50 : 402 = 402 : x
  2. Step 2: Convert to fraction form
    289.50/402 = 402/x
  3. Step 3: Cross multiply
    289.50x = 402 × 402
  4. Step 4: Simplify right side
    289.50x = 161,604
  5. Step 5: Solve for x
    x = 161,604/289.50
  6. Step 6: Final answer
    x = 558.22

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These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.