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Finding the Third Proportional to 72,720 and 156,915

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Solution

The third proportional to 72,720 and 156,915 is: 338,590.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,720 : 156,915 = 156,915 : x
  2. Step 2: Convert to fraction form
    72,720/156,915 = 156,915/x
  3. Step 3: Cross multiply
    72,720x = 156,915 × 156,915
  4. Step 4: Simplify right side
    72,720x = 24,622,317,225
  5. Step 5: Solve for x
    x = 24,622,317,225/72,720
  6. Step 6: Final answer
    x = 338,590.72

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.