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Finding the Fourth Proportional to 19,993,655.20, 29,990,482.80 and 19,209,834.40

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Solution

The fourth proportional to 19,993,655.20, 29,990,482.80 and 19,209,834.40 is: 28,814,751.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,993,655.20 : 29,990,482.80 = 19,209,834.40 : x
  2. Step 2: Convert to fraction form
    19,993,655.20/29,990,482.80 = 19,209,834.40/x
  3. Step 3: Cross multiply
    19,993,655.20x = 29,990,482.80 × 19,209,834.40
  4. Step 4: Simplify right side
    19,993,655.20x = 576,112,208,164,048.25
  5. Step 5: Solve for x
    x = 576,112,208,164,048.25/19,993,655.20
  6. Step 6: Final answer
    x = 28,814,751.60

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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.