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Finding the Fourth Proportional to 639,807.40, 959,451.90 and 218,866.60

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Solution

The fourth proportional to 639,807.40, 959,451.90 and 218,866.60 is: 328,211.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,807.40 : 959,451.90 = 218,866.60 : x
  2. Step 2: Convert to fraction form
    639,807.40/959,451.90 = 218,866.60/x
  3. Step 3: Cross multiply
    639,807.40x = 959,451.90 × 218,866.60
  4. Step 4: Simplify right side
    639,807.40x = 209,991,975,216.54
  5. Step 5: Solve for x
    x = 209,991,975,216.54/639,807.40
  6. Step 6: Final answer
    x = 328,211.23

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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.