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Finding the Fourth Proportional to 20,653,438.60, 30,978,845.70 and 7,006,558.60

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Solution

The fourth proportional to 20,653,438.60, 30,978,845.70 and 7,006,558.60 is: 10,509,392.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,653,438.60 : 30,978,845.70 = 7,006,558.60 : x
  2. Step 2: Convert to fraction form
    20,653,438.60/30,978,845.70 = 7,006,558.60/x
  3. Step 3: Cross multiply
    20,653,438.60x = 30,978,845.70 × 7,006,558.60
  4. Step 4: Simplify right side
    20,653,438.60x = 217,055,097,757,408
  5. Step 5: Solve for x
    x = 217,055,097,757,408/20,653,438.60
  6. Step 6: Final answer
    x = 10,509,392.74

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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.