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Finding the Fourth Proportional to 20,668,834.60, 30,990,810.30 and 10,591,138.60

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Solution

The fourth proportional to 20,668,834.60, 30,990,810.30 and 10,591,138.60 is: 15,880,332.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,668,834.60 : 30,990,810.30 = 10,591,138.60 : x
  2. Step 2: Convert to fraction form
    20,668,834.60/30,990,810.30 = 10,591,138.60/x
  3. Step 3: Cross multiply
    20,668,834.60x = 30,990,810.30 × 10,591,138.60
  4. Step 4: Simplify right side
    20,668,834.60x = 328,227,967,213,607.56
  5. Step 5: Solve for x
    x = 328,227,967,213,607.56/20,668,834.60
  6. Step 6: Final answer
    x = 15,880,332.57

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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.