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Finding the Fourth Proportional to 1,257.93, 1,886.42 and 680.49

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Solution

The fourth proportional to 1,257.93, 1,886.42 and 680.49 is: 1,020.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,257.93 : 1,886.42 = 680.49 : x
  2. Step 2: Convert to fraction form
    1,257.93/1,886.42 = 680.49/x
  3. Step 3: Cross multiply
    1,257.93x = 1,886.42 × 680.49
  4. Step 4: Simplify right side
    1,257.93x = 1,283,686.54
  5. Step 5: Solve for x
    x = 1,283,686.54/1,257.93
  6. Step 6: Final answer
    x = 1,020.48

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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.