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Finding the Third Proportional to 15,420 and 17,688

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Solution

The third proportional to 15,420 and 17,688 is: 20,289.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,420 : 17,688 = 17,688 : x
  2. Step 2: Convert to fraction form
    15,420/17,688 = 17,688/x
  3. Step 3: Cross multiply
    15,420x = 17,688 × 17,688
  4. Step 4: Simplify right side
    15,420x = 312,865,344
  5. Step 5: Solve for x
    x = 312,865,344/15,420
  6. Step 6: Final answer
    x = 20,289.58

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.