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Finding the Fourth Proportional to 3,918.60, 5,878.02 and 1,969.74

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Solution

The fourth proportional to 3,918.60, 5,878.02 and 1,969.74 is: 2,954.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,918.60 : 5,878.02 = 1,969.74 : x
  2. Step 2: Convert to fraction form
    3,918.60/5,878.02 = 1,969.74/x
  3. Step 3: Cross multiply
    3,918.60x = 5,878.02 × 1,969.74
  4. Step 4: Simplify right side
    3,918.60x = 11,578,171.11
  5. Step 5: Solve for x
    x = 11,578,171.11/3,918.60
  6. Step 6: Final answer
    x = 2,954.67

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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.