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Finding the Fourth Proportional to 639,621, 959,436.36 and 218,900.52

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Solution

The fourth proportional to 639,621, 959,436.36 and 218,900.52 is: 328,352.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,621 : 959,436.36 = 218,900.52 : x
  2. Step 2: Convert to fraction form
    639,621/959,436.36 = 218,900.52/x
  3. Step 3: Cross multiply
    639,621x = 959,436.36 × 218,900.52
  4. Step 4: Simplify right side
    639,621x = 210,021,118,110.91
  5. Step 5: Solve for x
    x = 210,021,118,110.91/639,621
  6. Step 6: Final answer
    x = 328,352.44

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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.