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Finding the Fourth Proportional to 66,980.80, 100,325.40 and 40,639.60

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Solution

The fourth proportional to 66,980.80, 100,325.40 and 40,639.60 is: 60,870.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,980.80 : 100,325.40 = 40,639.60 : x
  2. Step 2: Convert to fraction form
    66,980.80/100,325.40 = 40,639.60/x
  3. Step 3: Cross multiply
    66,980.80x = 100,325.40 × 40,639.60
  4. Step 4: Simplify right side
    66,980.80x = 4,077,184,125.84
  5. Step 5: Solve for x
    x = 4,077,184,125.84/66,980.80
  6. Step 6: Final answer
    x = 60,870.94

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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.