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Finding the Fourth Proportional to 7,129,678.40, 10,689,794.40 and 3,936,334.40

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Solution

The fourth proportional to 7,129,678.40, 10,689,794.40 and 3,936,334.40 is: 5,901,893.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,129,678.40 : 10,689,794.40 = 3,936,334.40 : x
  2. Step 2: Convert to fraction form
    7,129,678.40/10,689,794.40 = 3,936,334.40/x
  3. Step 3: Cross multiply
    7,129,678.40x = 10,689,794.40 × 3,936,334.40
  4. Step 4: Simplify right side
    7,129,678.40x = 42,078,605,425,647.36
  5. Step 5: Solve for x
    x = 42,078,605,425,647.36/7,129,678.40
  6. Step 6: Final answer
    x = 5,901,893.90

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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.