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Finding the Fourth Proportional to 20,630,125.20, 30,978,235.80 and 16,405,424.40

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Solution

The fourth proportional to 20,630,125.20, 30,978,235.80 and 16,405,424.40 is: 24,634,416.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,630,125.20 : 30,978,235.80 = 16,405,424.40 : x
  2. Step 2: Convert to fraction form
    20,630,125.20/30,978,235.80 = 16,405,424.40/x
  3. Step 3: Cross multiply
    20,630,125.20x = 30,978,235.80 × 16,405,424.40
  4. Step 4: Simplify right side
    20,630,125.20x = 508,211,105,462,273.56
  5. Step 5: Solve for x
    x = 508,211,105,462,273.56/20,630,125.20
  6. Step 6: Final answer
    x = 24,634,416.93

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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.