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Finding the Fourth Proportional to 18,661,347.40, 27,992,021.10 and 7,890,809.80

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Solution

The fourth proportional to 18,661,347.40, 27,992,021.10 and 7,890,809.80 is: 11,836,214.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,661,347.40 : 27,992,021.10 = 7,890,809.80 : x
  2. Step 2: Convert to fraction form
    18,661,347.40/27,992,021.10 = 7,890,809.80/x
  3. Step 3: Cross multiply
    18,661,347.40x = 27,992,021.10 × 7,890,809.80
  4. Step 4: Simplify right side
    18,661,347.40x = 220,879,714,417,686.78
  5. Step 5: Solve for x
    x = 220,879,714,417,686.78/18,661,347.40
  6. Step 6: Final answer
    x = 11,836,214.70

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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.