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Finding the Fourth Proportional to 1,257.75, 1,878.39 and 1,084.77

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Solution

The fourth proportional to 1,257.75, 1,878.39 and 1,084.77 is: 1,620.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,257.75 : 1,878.39 = 1,084.77 : x
  2. Step 2: Convert to fraction form
    1,257.75/1,878.39 = 1,084.77/x
  3. Step 3: Cross multiply
    1,257.75x = 1,878.39 × 1,084.77
  4. Step 4: Simplify right side
    1,257.75x = 2,037,621.12
  5. Step 5: Solve for x
    x = 2,037,621.12/1,257.75
  6. Step 6: Final answer
    x = 1,620.05

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.