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Finding the Fourth Proportional to 639,622, 959,437.86 and 218,901.52

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Solution

The fourth proportional to 639,622, 959,437.86 and 218,901.52 is: 328,353.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,622 : 959,437.86 = 218,901.52 : x
  2. Step 2: Convert to fraction form
    639,622/959,437.86 = 218,901.52/x
  3. Step 3: Cross multiply
    639,622x = 959,437.86 × 218,901.52
  4. Step 4: Simplify right side
    639,622x = 210,022,405,899.55
  5. Step 5: Solve for x
    x = 210,022,405,899.55/639,622
  6. Step 6: Final answer
    x = 328,353.94

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1.5x scale

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.