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Finding the Fourth Proportional to 1,980.63, 2,972.03 and 1,115.01

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Solution

The fourth proportional to 1,980.63, 2,972.03 and 1,115.01 is: 1,673.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,980.63 : 2,972.03 = 1,115.01 : x
  2. Step 2: Convert to fraction form
    1,980.63/2,972.03 = 1,115.01/x
  3. Step 3: Cross multiply
    1,980.63x = 2,972.03 × 1,115.01
  4. Step 4: Simplify right side
    1,980.63x = 3,313,837.60
  5. Step 5: Solve for x
    x = 3,313,837.60/1,980.63
  6. Step 6: Final answer
    x = 1,673.12

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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.