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Finding the Fourth Proportional to 205,521.20, 308,208.90 and 72,405.80

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Solution

The fourth proportional to 205,521.20, 308,208.90 and 72,405.80 is: 108,583.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    205,521.20 : 308,208.90 = 72,405.80 : x
  2. Step 2: Convert to fraction form
    205,521.20/308,208.90 = 72,405.80/x
  3. Step 3: Cross multiply
    205,521.20x = 308,208.90 × 72,405.80
  4. Step 4: Simplify right side
    205,521.20x = 22,316,111,971.62
  5. Step 5: Solve for x
    x = 22,316,111,971.62/205,521.20
  6. Step 6: Final answer
    x = 108,583.02

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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.