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Finding the Third Proportional to 86,040 and 128,136

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Solution

The third proportional to 86,040 and 128,136 is: 190,827.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,040 : 128,136 = 128,136 : x
  2. Step 2: Convert to fraction form
    86,040/128,136 = 128,136/x
  3. Step 3: Cross multiply
    86,040x = 128,136 × 128,136
  4. Step 4: Simplify right side
    86,040x = 16,418,834,496
  5. Step 5: Solve for x
    x = 16,418,834,496/86,040
  6. Step 6: Final answer
    x = 190,827.92

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.