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Finding the Third Proportional to 15,688 and 21,324

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Solution

The third proportional to 15,688 and 21,324 is: 28,984.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,688 : 21,324 = 21,324 : x
  2. Step 2: Convert to fraction form
    15,688/21,324 = 21,324/x
  3. Step 3: Cross multiply
    15,688x = 21,324 × 21,324
  4. Step 4: Simplify right side
    15,688x = 454,712,976
  5. Step 5: Solve for x
    x = 454,712,976/15,688
  6. Step 6: Final answer
    x = 28,984.76

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.