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Finding the Fourth Proportional to 20,367,978.60, 28,108,343.18 and 11,076,092.12

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Solution

The fourth proportional to 20,367,978.60, 28,108,343.18 and 11,076,092.12 is: 15,285,296.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,367,978.60 : 28,108,343.18 = 11,076,092.12 : x
  2. Step 2: Convert to fraction form
    20,367,978.60/28,108,343.18 = 11,076,092.12/x
  3. Step 3: Cross multiply
    20,367,978.60x = 28,108,343.18 × 11,076,092.12
  4. Step 4: Simplify right side
    20,367,978.60x = 311,330,598,390,000.06
  5. Step 5: Solve for x
    x = 311,330,598,390,000.06/20,367,978.60
  6. Step 6: Final answer
    x = 15,285,296.81

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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.