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Finding the Fourth Proportional to 1,911.97, 2,862.42 and 985.33

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Solution

The fourth proportional to 1,911.97, 2,862.42 and 985.33 is: 1,475.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,911.97 : 2,862.42 = 985.33 : x
  2. Step 2: Convert to fraction form
    1,911.97/2,862.42 = 985.33/x
  3. Step 3: Cross multiply
    1,911.97x = 2,862.42 × 985.33
  4. Step 4: Simplify right side
    1,911.97x = 2,820,428.30
  5. Step 5: Solve for x
    x = 2,820,428.30/1,911.97
  6. Step 6: Final answer
    x = 1,475.14

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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.