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Finding the Fourth Proportional to 1,911.79, 2,868.36 and 938.44

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Solution

The fourth proportional to 1,911.79, 2,868.36 and 938.44 is: 1,407.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,911.79 : 2,868.36 = 938.44 : x
  2. Step 2: Convert to fraction form
    1,911.79/2,868.36 = 938.44/x
  3. Step 3: Cross multiply
    1,911.79x = 2,868.36 × 938.44
  4. Step 4: Simplify right side
    1,911.79x = 2,691,783.76
  5. Step 5: Solve for x
    x = 2,691,783.76/1,911.79
  6. Step 6: Final answer
    x = 1,407.99

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1.5x scale

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.