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Finding the Fourth Proportional to 138,267, 207,405.36 and 79,075.44

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Solution

The fourth proportional to 138,267, 207,405.36 and 79,075.44 is: 118,615.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,267 : 207,405.36 = 79,075.44 : x
  2. Step 2: Convert to fraction form
    138,267/207,405.36 = 79,075.44/x
  3. Step 3: Cross multiply
    138,267x = 207,405.36 × 79,075.44
  4. Step 4: Simplify right side
    138,267x = 16,400,670,100.36
  5. Step 5: Solve for x
    x = 16,400,670,100.36/138,267
  6. Step 6: Final answer
    x = 118,615.94

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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.