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Finding the Fourth Proportional to 209,986.70, 314,980.05 and 191,615.90

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Solution

The fourth proportional to 209,986.70, 314,980.05 and 191,615.90 is: 287,423.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    209,986.70 : 314,980.05 = 191,615.90 : x
  2. Step 2: Convert to fraction form
    209,986.70/314,980.05 = 191,615.90/x
  3. Step 3: Cross multiply
    209,986.70x = 314,980.05 × 191,615.90
  4. Step 4: Simplify right side
    209,986.70x = 60,355,185,762.80
  5. Step 5: Solve for x
    x = 60,355,185,762.80/209,986.70
  6. Step 6: Final answer
    x = 287,423.85

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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.