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Finding the Fourth Proportional to 1,257.19, 1,886.22 and 640.37

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Solution

The fourth proportional to 1,257.19, 1,886.22 and 640.37 is: 960.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,257.19 : 1,886.22 = 640.37 : x
  2. Step 2: Convert to fraction form
    1,257.19/1,886.22 = 640.37/x
  3. Step 3: Cross multiply
    1,257.19x = 1,886.22 × 640.37
  4. Step 4: Simplify right side
    1,257.19x = 1,207,883.42
  5. Step 5: Solve for x
    x = 1,207,883.42/1,257.19
  6. Step 6: Final answer
    x = 960.78

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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.