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Finding the Fourth Proportional to 1,911.90, 2,868.12 and 938.02

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Solution

The fourth proportional to 1,911.90, 2,868.12 and 938.02 is: 1,407.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,911.90 : 2,868.12 = 938.02 : x
  2. Step 2: Convert to fraction form
    1,911.90/2,868.12 = 938.02/x
  3. Step 3: Cross multiply
    1,911.90x = 2,868.12 × 938.02
  4. Step 4: Simplify right side
    1,911.90x = 2,690,353.92
  5. Step 5: Solve for x
    x = 2,690,353.92/1,911.90
  6. Step 6: Final answer
    x = 1,407.16

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.