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Finding the Third Proportional to 35,712 and 78,120

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Solution

The third proportional to 35,712 and 78,120 is: 170,887.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    35,712 : 78,120 = 78,120 : x
  2. Step 2: Convert to fraction form
    35,712/78,120 = 78,120/x
  3. Step 3: Cross multiply
    35,712x = 78,120 × 78,120
  4. Step 4: Simplify right side
    35,712x = 6,102,734,400
  5. Step 5: Solve for x
    x = 6,102,734,400/35,712
  6. Step 6: Final answer
    x = 170,887.50

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Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.