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Finding the Fourth Proportional to 86,940.70, 130,119.45 and 76,443.10

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Solution

The fourth proportional to 86,940.70, 130,119.45 and 76,443.10 is: 114,408.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,940.70 : 130,119.45 = 76,443.10 : x
  2. Step 2: Convert to fraction form
    86,940.70/130,119.45 = 76,443.10/x
  3. Step 3: Cross multiply
    86,940.70x = 130,119.45 × 76,443.10
  4. Step 4: Simplify right side
    86,940.70x = 9,946,734,128.30
  5. Step 5: Solve for x
    x = 9,946,734,128.30/86,940.70
  6. Step 6: Final answer
    x = 114,408.26

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.