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Finding the Third Proportional to 86,388.40 and 128,916.25

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Solution

The third proportional to 86,388.40 and 128,916.25 is: 192,379.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,388.40 : 128,916.25 = 128,916.25 : x
  2. Step 2: Convert to fraction form
    86,388.40/128,916.25 = 128,916.25/x
  3. Step 3: Cross multiply
    86,388.40x = 128,916.25 × 128,916.25
  4. Step 4: Simplify right side
    86,388.40x = 16,619,398,506.90
  5. Step 5: Solve for x
    x = 16,619,398,506.90/86,388.40
  6. Step 6: Final answer
    x = 192,379.98

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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.