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Finding the Fourth Proportional to 644,630.60, 966,605.70 and 218,019.80

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Solution

The fourth proportional to 644,630.60, 966,605.70 and 218,019.80 is: 326,914.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,630.60 : 966,605.70 = 218,019.80 : x
  2. Step 2: Convert to fraction form
    644,630.60/966,605.70 = 218,019.80/x
  3. Step 3: Cross multiply
    644,630.60x = 966,605.70 × 218,019.80
  4. Step 4: Simplify right side
    644,630.60x = 210,739,181,392.86
  5. Step 5: Solve for x
    x = 210,739,181,392.86/644,630.60
  6. Step 6: Final answer
    x = 326,914.64

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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.