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Finding the Third Proportional to 15,507 and 21,015

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Solution

The third proportional to 15,507 and 21,015 is: 28,479.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,507 : 21,015 = 21,015 : x
  2. Step 2: Convert to fraction form
    15,507/21,015 = 21,015/x
  3. Step 3: Cross multiply
    15,507x = 21,015 × 21,015
  4. Step 4: Simplify right side
    15,507x = 441,630,225
  5. Step 5: Solve for x
    x = 441,630,225/15,507
  6. Step 6: Final answer
    x = 28,479.41

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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.