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Finding the Fourth Proportional to 126,075.40, 188,991.60 and 72,712.60

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Solution

The fourth proportional to 126,075.40, 188,991.60 and 72,712.60 is: 108,998.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    126,075.40 : 188,991.60 = 72,712.60 : x
  2. Step 2: Convert to fraction form
    126,075.40/188,991.60 = 72,712.60/x
  3. Step 3: Cross multiply
    126,075.40x = 188,991.60 × 72,712.60
  4. Step 4: Simplify right side
    126,075.40x = 13,742,070,614.16
  5. Step 5: Solve for x
    x = 13,742,070,614.16/126,075.40
  6. Step 6: Final answer
    x = 108,998.83

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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.