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Finding the Third Proportional to 19,988 and 28,478

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Solution

The third proportional to 19,988 and 28,478 is: 40,574.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,988 : 28,478 = 28,478 : x
  2. Step 2: Convert to fraction form
    19,988/28,478 = 28,478/x
  3. Step 3: Cross multiply
    19,988x = 28,478 × 28,478
  4. Step 4: Simplify right side
    19,988x = 810,996,484
  5. Step 5: Solve for x
    x = 810,996,484/19,988
  6. Step 6: Final answer
    x = 40,574.17

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Why These Related Problems?

These problems maintain the same ratio (1.42) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.