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Finding the Fourth Proportional to 102,858.80, 154,128.60 and 71,330.36

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Solution

The fourth proportional to 102,858.80, 154,128.60 and 71,330.36 is: 106,884.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    102,858.80 : 154,128.60 = 71,330.36 : x
  2. Step 2: Convert to fraction form
    102,858.80/154,128.60 = 71,330.36/x
  3. Step 3: Cross multiply
    102,858.80x = 154,128.60 × 71,330.36
  4. Step 4: Simplify right side
    102,858.80x = 10,994,048,524.30
  5. Step 5: Solve for x
    x = 10,994,048,524.30/102,858.80
  6. Step 6: Final answer
    x = 106,884.86

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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.