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Finding the Fourth Proportional to 205,616.40, 308,424.60 and 142,630.80

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Solution

The fourth proportional to 205,616.40, 308,424.60 and 142,630.80 is: 213,946.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    205,616.40 : 308,424.60 = 142,630.80 : x
  2. Step 2: Convert to fraction form
    205,616.40/308,424.60 = 142,630.80/x
  3. Step 3: Cross multiply
    205,616.40x = 308,424.60 × 142,630.80
  4. Step 4: Simplify right side
    205,616.40x = 43,990,847,437.68
  5. Step 5: Solve for x
    x = 43,990,847,437.68/205,616.40
  6. Step 6: Final answer
    x = 213,946.20

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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.