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Finding the Fourth Proportional to 639,386.60, 957,816.30 and 324,069.80

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Solution

The fourth proportional to 639,386.60, 957,816.30 and 324,069.80 is: 485,464.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,386.60 : 957,816.30 = 324,069.80 : x
  2. Step 2: Convert to fraction form
    639,386.60/957,816.30 = 324,069.80/x
  3. Step 3: Cross multiply
    639,386.60x = 957,816.30 × 324,069.80
  4. Step 4: Simplify right side
    639,386.60x = 310,399,336,777.74
  5. Step 5: Solve for x
    x = 310,399,336,777.74/639,386.60
  6. Step 6: Final answer
    x = 485,464.25

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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.