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Finding the Fourth Proportional to 18,979,783.20, 28,469,674.80 and 13,903,610.40

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Solution

The fourth proportional to 18,979,783.20, 28,469,674.80 and 13,903,610.40 is: 20,855,415.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,979,783.20 : 28,469,674.80 = 13,903,610.40 : x
  2. Step 2: Convert to fraction form
    18,979,783.20/28,469,674.80 = 13,903,610.40/x
  3. Step 3: Cross multiply
    18,979,783.20x = 28,469,674.80 × 13,903,610.40
  4. Step 4: Simplify right side
    18,979,783.20x = 395,831,266,633,897.94
  5. Step 5: Solve for x
    x = 395,831,266,633,897.94/18,979,783.20
  6. Step 6: Final answer
    x = 20,855,415.60

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1.5x scale

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.