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Finding the Fourth Proportional to 1,911.70, 2,867.88 and 679.18

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Solution

The fourth proportional to 1,911.70, 2,867.88 and 679.18 is: 1,018.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,911.70 : 2,867.88 = 679.18 : x
  2. Step 2: Convert to fraction form
    1,911.70/2,867.88 = 679.18/x
  3. Step 3: Cross multiply
    1,911.70x = 2,867.88 × 679.18
  4. Step 4: Simplify right side
    1,911.70x = 1,947,806.74
  5. Step 5: Solve for x
    x = 1,947,806.74/1,911.70
  6. Step 6: Final answer
    x = 1,018.89

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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.