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Finding the Fourth Proportional to 102,918.80, 154,075.80 and 76,739.60

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Solution

The fourth proportional to 102,918.80, 154,075.80 and 76,739.60 is: 114,883.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    102,918.80 : 154,075.80 = 76,739.60 : x
  2. Step 2: Convert to fraction form
    102,918.80/154,075.80 = 76,739.60/x
  3. Step 3: Cross multiply
    102,918.80x = 154,075.80 × 76,739.60
  4. Step 4: Simplify right side
    102,918.80x = 11,823,715,261.68
  5. Step 5: Solve for x
    x = 11,823,715,261.68/102,918.80
  6. Step 6: Final answer
    x = 114,883.92

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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.