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Finding the Third Proportional to 5,390 and 9,988

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Solution

The third proportional to 5,390 and 9,988 is: 18,508.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,390 : 9,988 = 9,988 : x
  2. Step 2: Convert to fraction form
    5,390/9,988 = 9,988/x
  3. Step 3: Cross multiply
    5,390x = 9,988 × 9,988
  4. Step 4: Simplify right side
    5,390x = 99,760,144
  5. Step 5: Solve for x
    x = 99,760,144/5,390
  6. Step 6: Final answer
    x = 18,508.38

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Why These Related Problems?

These problems maintain the same ratio (1.85) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.