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Finding the Fourth Proportional to 20,692,664.68, 28,553,289.60 and 11,990,679.16

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Solution

The fourth proportional to 20,692,664.68, 28,553,289.60 and 11,990,679.16 is: 16,545,637.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,692,664.68 : 28,553,289.60 = 11,990,679.16 : x
  2. Step 2: Convert to fraction form
    20,692,664.68/28,553,289.60 = 11,990,679.16/x
  3. Step 3: Cross multiply
    20,692,664.68x = 28,553,289.60 × 11,990,679.16
  4. Step 4: Simplify right side
    20,692,664.68x = 342,373,334,556,164.75
  5. Step 5: Solve for x
    x = 342,373,334,556,164.75/20,692,664.68
  6. Step 6: Final answer
    x = 16,545,637.78

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.