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Finding the Fourth Proportional to 680,280.14, 938,825.37 and 389,940.03

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Solution

The fourth proportional to 680,280.14, 938,825.37 and 389,940.03 is: 538,139.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    680,280.14 : 938,825.37 = 389,940.03 : x
  2. Step 2: Convert to fraction form
    680,280.14/938,825.37 = 389,940.03/x
  3. Step 3: Cross multiply
    680,280.14x = 938,825.37 × 389,940.03
  4. Step 4: Simplify right side
    680,280.14x = 366,085,592,942.56
  5. Step 5: Solve for x
    x = 366,085,592,942.56/680,280.14
  6. Step 6: Final answer
    x = 538,139.47

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1.5x scale

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.