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Finding the Fourth Proportional to 86,661.20, 130,010.70 and 49,239.20

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Solution

The fourth proportional to 86,661.20, 130,010.70 and 49,239.20 is: 73,869.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,661.20 : 130,010.70 = 49,239.20 : x
  2. Step 2: Convert to fraction form
    86,661.20/130,010.70 = 49,239.20/x
  3. Step 3: Cross multiply
    86,661.20x = 130,010.70 × 49,239.20
  4. Step 4: Simplify right side
    86,661.20x = 6,401,622,859.44
  5. Step 5: Solve for x
    x = 6,401,622,859.44/86,661.20
  6. Step 6: Final answer
    x = 73,869.54

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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.