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Finding the Fourth Proportional to 656,390.57, 905,815.60 and 380,804.16

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Solution

The fourth proportional to 656,390.57, 905,815.60 and 380,804.16 is: 525,507.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    656,390.57 : 905,815.60 = 380,804.16 : x
  2. Step 2: Convert to fraction form
    656,390.57/905,815.60 = 380,804.16/x
  3. Step 3: Cross multiply
    656,390.57x = 905,815.60 × 380,804.16
  4. Step 4: Simplify right side
    656,390.57x = 344,938,347,720.89
  5. Step 5: Solve for x
    x = 344,938,347,720.89/656,390.57
  6. Step 6: Final answer
    x = 525,507.77

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.