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Finding the Fourth Proportional to 1,979.87, 2,968.42 and 868.75

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Solution

The fourth proportional to 1,979.87, 2,968.42 and 868.75 is: 1,302.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,979.87 : 2,968.42 = 868.75 : x
  2. Step 2: Convert to fraction form
    1,979.87/2,968.42 = 868.75/x
  3. Step 3: Cross multiply
    1,979.87x = 2,968.42 × 868.75
  4. Step 4: Simplify right side
    1,979.87x = 2,578,814.88
  5. Step 5: Solve for x
    x = 2,578,814.88/1,979.87
  6. Step 6: Final answer
    x = 1,302.52

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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.