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Finding the Fourth Proportional to 20,668,801.20, 30,929,718.60 and 18,002,410.80

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Solution

The fourth proportional to 20,668,801.20, 30,929,718.60 and 18,002,410.80 is: 26,939,612.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,668,801.20 : 30,929,718.60 = 18,002,410.80 : x
  2. Step 2: Convert to fraction form
    20,668,801.20/30,929,718.60 = 18,002,410.80/x
  3. Step 3: Cross multiply
    20,668,801.20x = 30,929,718.60 × 18,002,410.80
  4. Step 4: Simplify right side
    20,668,801.20x = 556,809,500,165,600.94
  5. Step 5: Solve for x
    x = 556,809,500,165,600.94/20,668,801.20
  6. Step 6: Final answer
    x = 26,939,612.74

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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.