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Finding the Third Proportional to 20,403 and 31,209.75

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Solution

The third proportional to 20,403 and 31,209.75 is: 47,740.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,403 : 31,209.75 = 31,209.75 : x
  2. Step 2: Convert to fraction form
    20,403/31,209.75 = 31,209.75/x
  3. Step 3: Cross multiply
    20,403x = 31,209.75 × 31,209.75
  4. Step 4: Simplify right side
    20,403x = 974,048,495.06
  5. Step 5: Solve for x
    x = 974,048,495.06/20,403
  6. Step 6: Final answer
    x = 47,740.45

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Why These Related Problems?

These problems maintain the same ratio (1.53) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.