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Finding the Fourth Proportional to 639,563.40, 959,085.90 and 218,622.60

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Solution

The fourth proportional to 639,563.40, 959,085.90 and 218,622.60 is: 327,845.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,563.40 : 959,085.90 = 218,622.60 : x
  2. Step 2: Convert to fraction form
    639,563.40/959,085.90 = 218,622.60/x
  3. Step 3: Cross multiply
    639,563.40x = 959,085.90 × 218,622.60
  4. Step 4: Simplify right side
    639,563.40x = 209,677,853,081.34
  5. Step 5: Solve for x
    x = 209,677,853,081.34/639,563.40
  6. Step 6: Final answer
    x = 327,845.30

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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.