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Finding the Fourth Proportional to 18,783,647.85, 28,163,957.22 and 7,994,805.06

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Solution

The fourth proportional to 18,783,647.85, 28,163,957.22 and 7,994,805.06 is: 11,987,306.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,783,647.85 : 28,163,957.22 = 7,994,805.06 : x
  2. Step 2: Convert to fraction form
    18,783,647.85/28,163,957.22 = 7,994,805.06/x
  3. Step 3: Cross multiply
    18,783,647.85x = 28,163,957.22 × 7,994,805.06
  4. Step 4: Simplify right side
    18,783,647.85x = 225,165,347,692,079.50
  5. Step 5: Solve for x
    x = 225,165,347,692,079.50/18,783,647.85
  6. Step 6: Final answer
    x = 11,987,306.70

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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.