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Finding the Fourth Proportional to 1,256.73, 1,885.31 and 640.19

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Solution

The fourth proportional to 1,256.73, 1,885.31 and 640.19 is: 960.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,256.73 : 1,885.31 = 640.19 : x
  2. Step 2: Convert to fraction form
    1,256.73/1,885.31 = 640.19/x
  3. Step 3: Cross multiply
    1,256.73x = 1,885.31 × 640.19
  4. Step 4: Simplify right side
    1,256.73x = 1,206,943.98
  5. Step 5: Solve for x
    x = 1,206,943.98/1,256.73
  6. Step 6: Final answer
    x = 960.38

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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.