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Finding the Fourth Proportional to 1,256.23, 1,886.10 and 640.43

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Solution

The fourth proportional to 1,256.23, 1,886.10 and 640.43 is: 961.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,256.23 : 1,886.10 = 640.43 : x
  2. Step 2: Convert to fraction form
    1,256.23/1,886.10 = 640.43/x
  3. Step 3: Cross multiply
    1,256.23x = 1,886.10 × 640.43
  4. Step 4: Simplify right side
    1,256.23x = 1,207,915.02
  5. Step 5: Solve for x
    x = 1,207,915.02/1,256.23
  6. Step 6: Final answer
    x = 961.54

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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.