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Finding the Fourth Proportional to 1,911.66, 2,868.75 and 679.05

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Solution

The fourth proportional to 1,911.66, 2,868.75 and 679.05 is: 1,019.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,911.66 : 2,868.75 = 679.05 : x
  2. Step 2: Convert to fraction form
    1,911.66/2,868.75 = 679.05/x
  3. Step 3: Cross multiply
    1,911.66x = 2,868.75 × 679.05
  4. Step 4: Simplify right side
    1,911.66x = 1,948,024.69
  5. Step 5: Solve for x
    x = 1,948,024.69/1,911.66
  6. Step 6: Final answer
    x = 1,019.02

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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.