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Finding the Fourth Proportional to 1,939.65, 2,908.95 and 843.75

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Solution

The fourth proportional to 1,939.65, 2,908.95 and 843.75 is: 1,265.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,939.65 : 2,908.95 = 843.75 : x
  2. Step 2: Convert to fraction form
    1,939.65/2,908.95 = 843.75/x
  3. Step 3: Cross multiply
    1,939.65x = 2,908.95 × 843.75
  4. Step 4: Simplify right side
    1,939.65x = 2,454,423.40
  5. Step 5: Solve for x
    x = 2,454,423.40/1,939.65
  6. Step 6: Final answer
    x = 1,265.40

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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.