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Finding the Third Proportional to 139.78 and 290.53

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Solution

The third proportional to 139.78 and 290.53 is: 603.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.78 : 290.53 = 290.53 : x
  2. Step 2: Convert to fraction form
    139.78/290.53 = 290.53/x
  3. Step 3: Cross multiply
    139.78x = 290.53 × 290.53
  4. Step 4: Simplify right side
    139.78x = 84,408.41
  5. Step 5: Solve for x
    x = 84,408.41/139.78
  6. Step 6: Final answer
    x = 603.86

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Why These Related Problems?

These problems maintain the same ratio (2.08) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.