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Finding the Fourth Proportional to 639,930.94, 959,953.80 and 166,620.40

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Solution

The fourth proportional to 639,930.94, 959,953.80 and 166,620.40 is: 249,945.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,930.94 : 959,953.80 = 166,620.40 : x
  2. Step 2: Convert to fraction form
    639,930.94/959,953.80 = 166,620.40/x
  3. Step 3: Cross multiply
    639,930.94x = 959,953.80 × 166,620.40
  4. Step 4: Simplify right side
    639,930.94x = 159,947,886,137.52
  5. Step 5: Solve for x
    x = 159,947,886,137.52/639,930.94
  6. Step 6: Final answer
    x = 249,945.54

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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.