Home / 1,980.36-2,969.16-869.24

Finding the Fourth Proportional to 1,980.36, 2,969.16 and 869.24

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Solution

The fourth proportional to 1,980.36, 2,969.16 and 869.24 is: 1,303.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,980.36 : 2,969.16 = 869.24 : x
  2. Step 2: Convert to fraction form
    1,980.36/2,969.16 = 869.24/x
  3. Step 3: Cross multiply
    1,980.36x = 2,969.16 × 869.24
  4. Step 4: Simplify right side
    1,980.36x = 2,580,912.64
  5. Step 5: Solve for x
    x = 2,580,912.64/1,980.36
  6. Step 6: Final answer
    x = 1,303.25

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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.