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Finding the Third Proportional to 18,918.50 and 28,521.75

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Solution

The third proportional to 18,918.50 and 28,521.75 is: 42,999.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,918.50 : 28,521.75 = 28,521.75 : x
  2. Step 2: Convert to fraction form
    18,918.50/28,521.75 = 28,521.75/x
  3. Step 3: Cross multiply
    18,918.50x = 28,521.75 × 28,521.75
  4. Step 4: Simplify right side
    18,918.50x = 813,490,223.06
  5. Step 5: Solve for x
    x = 813,490,223.06/18,918.50
  6. Step 6: Final answer
    x = 42,999.72

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.