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Finding the Fourth Proportional to 1,870.92, 2,579.94 and 1,311.21

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Solution

The fourth proportional to 1,870.92, 2,579.94 and 1,311.21 is: 1,808.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,870.92 : 2,579.94 = 1,311.21 : x
  2. Step 2: Convert to fraction form
    1,870.92/2,579.94 = 1,311.21/x
  3. Step 3: Cross multiply
    1,870.92x = 2,579.94 × 1,311.21
  4. Step 4: Simplify right side
    1,870.92x = 3,382,843.13
  5. Step 5: Solve for x
    x = 3,382,843.13/1,870.92
  6. Step 6: Final answer
    x = 1,808.12

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.