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Finding the Fourth Proportional to 405,005.40, 606,195.90 and 286,907.40

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Solution

The fourth proportional to 405,005.40, 606,195.90 and 286,907.40 is: 429,431.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,005.40 : 606,195.90 = 286,907.40 : x
  2. Step 2: Convert to fraction form
    405,005.40/606,195.90 = 286,907.40/x
  3. Step 3: Cross multiply
    405,005.40x = 606,195.90 × 286,907.40
  4. Step 4: Simplify right side
    405,005.40x = 173,922,089,559.66
  5. Step 5: Solve for x
    x = 173,922,089,559.66/405,005.40
  6. Step 6: Final answer
    x = 429,431.53

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1.5x scale

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.