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Finding the Third Proportional to 39,312 and 55,580

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Solution

The third proportional to 39,312 and 55,580 is: 78,579.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,312 : 55,580 = 55,580 : x
  2. Step 2: Convert to fraction form
    39,312/55,580 = 55,580/x
  3. Step 3: Cross multiply
    39,312x = 55,580 × 55,580
  4. Step 4: Simplify right side
    39,312x = 3,089,136,400
  5. Step 5: Solve for x
    x = 3,089,136,400/39,312
  6. Step 6: Final answer
    x = 78,579.99

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Why These Related Problems?

These problems maintain the same ratio (1.41) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.