Home / 1,980.05-2,969.87-1,247.40

Finding the Fourth Proportional to 1,980.05, 2,969.87 and 1,247.40

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Solution

The fourth proportional to 1,980.05, 2,969.87 and 1,247.40 is: 1,870.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,980.05 : 2,969.87 = 1,247.40 : x
  2. Step 2: Convert to fraction form
    1,980.05/2,969.87 = 1,247.40/x
  3. Step 3: Cross multiply
    1,980.05x = 2,969.87 × 1,247.40
  4. Step 4: Simplify right side
    1,980.05x = 3,704,609.60
  5. Step 5: Solve for x
    x = 3,704,609.60/1,980.05
  6. Step 6: Final answer
    x = 1,870.97

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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.