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Finding the Third Proportional to 390.38 and 608.63

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Solution

The third proportional to 390.38 and 608.63 is: 948.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.38 : 608.63 = 608.63 : x
  2. Step 2: Convert to fraction form
    390.38/608.63 = 608.63/x
  3. Step 3: Cross multiply
    390.38x = 608.63 × 608.63
  4. Step 4: Simplify right side
    390.38x = 370,424.39
  5. Step 5: Solve for x
    x = 370,424.39/390.38
  6. Step 6: Final answer
    x = 948.89

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Why These Related Problems?

These problems maintain the same ratio (1.56) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.