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Finding the Fourth Proportional to 256,764.78, 354,328.76 and 142,040.44

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Solution

The fourth proportional to 256,764.78, 354,328.76 and 142,040.44 is: 196,012.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,764.78 : 354,328.76 = 142,040.44 : x
  2. Step 2: Convert to fraction form
    256,764.78/354,328.76 = 142,040.44/x
  3. Step 3: Cross multiply
    256,764.78x = 354,328.76 × 142,040.44
  4. Step 4: Simplify right side
    256,764.78x = 50,329,012,975.05
  5. Step 5: Solve for x
    x = 50,329,012,975.05/256,764.78
  6. Step 6: Final answer
    x = 196,012.14

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.