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Finding the Third Proportional to 72,109 and 155,312

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Solution

The third proportional to 72,109 and 155,312 is: 334,518.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,109 : 155,312 = 155,312 : x
  2. Step 2: Convert to fraction form
    72,109/155,312 = 155,312/x
  3. Step 3: Cross multiply
    72,109x = 155,312 × 155,312
  4. Step 4: Simplify right side
    72,109x = 24,121,817,344
  5. Step 5: Solve for x
    x = 24,121,817,344/72,109
  6. Step 6: Final answer
    x = 334,518.82

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.