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Finding the Fourth Proportional to 1,911.88, 2,867.56 and 678.96

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Solution

The fourth proportional to 1,911.88, 2,867.56 and 678.96 is: 1,018.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,911.88 : 2,867.56 = 678.96 : x
  2. Step 2: Convert to fraction form
    1,911.88/2,867.56 = 678.96/x
  3. Step 3: Cross multiply
    1,911.88x = 2,867.56 × 678.96
  4. Step 4: Simplify right side
    1,911.88x = 1,946,958.54
  5. Step 5: Solve for x
    x = 1,946,958.54/1,911.88
  6. Step 6: Final answer
    x = 1,018.35

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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.