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Finding the Fourth Proportional to 103,939.20, 155,908.80 and 102,556.80

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Solution

The fourth proportional to 103,939.20, 155,908.80 and 102,556.80 is: 153,835.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,939.20 : 155,908.80 = 102,556.80 : x
  2. Step 2: Convert to fraction form
    103,939.20/155,908.80 = 102,556.80/x
  3. Step 3: Cross multiply
    103,939.20x = 155,908.80 × 102,556.80
  4. Step 4: Simplify right side
    103,939.20x = 15,989,507,619.84
  5. Step 5: Solve for x
    x = 15,989,507,619.84/103,939.20
  6. Step 6: Final answer
    x = 153,835.20

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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.