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Finding the Third Proportional to 55,560 and 78,240

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Solution

The third proportional to 55,560 and 78,240 is: 110,178.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    55,560 : 78,240 = 78,240 : x
  2. Step 2: Convert to fraction form
    55,560/78,240 = 78,240/x
  3. Step 3: Cross multiply
    55,560x = 78,240 × 78,240
  4. Step 4: Simplify right side
    55,560x = 6,121,497,600
  5. Step 5: Solve for x
    x = 6,121,497,600/55,560
  6. Step 6: Final answer
    x = 110,178.14

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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.