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Finding the Third Proportional to 4,988 and 7,678

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Solution

The third proportional to 4,988 and 7,678 is: 11,818.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,988 : 7,678 = 7,678 : x
  2. Step 2: Convert to fraction form
    4,988/7,678 = 7,678/x
  3. Step 3: Cross multiply
    4,988x = 7,678 × 7,678
  4. Step 4: Simplify right side
    4,988x = 58,951,684
  5. Step 5: Solve for x
    x = 58,951,684/4,988
  6. Step 6: Final answer
    x = 11,818.70

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Why These Related Problems?

These problems maintain the same ratio (1.54) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.