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Finding the Fourth Proportional to 66,972.80, 100,313.40 and 40,631.60

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Solution

The fourth proportional to 66,972.80, 100,313.40 and 40,631.60 is: 60,858.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,972.80 : 100,313.40 = 40,631.60 : x
  2. Step 2: Convert to fraction form
    66,972.80/100,313.40 = 40,631.60/x
  3. Step 3: Cross multiply
    66,972.80x = 100,313.40 × 40,631.60
  4. Step 4: Simplify right side
    66,972.80x = 4,075,893,943.44
  5. Step 5: Solve for x
    x = 4,075,893,943.44/66,972.80
  6. Step 6: Final answer
    x = 60,858.94

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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.