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Finding the Fourth Proportional to 620,357.16, 856,187.10 and 378,780.60

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Solution

The fourth proportional to 620,357.16, 856,187.10 and 378,780.60 is: 522,774.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,357.16 : 856,187.10 = 378,780.60 : x
  2. Step 2: Convert to fraction form
    620,357.16/856,187.10 = 378,780.60/x
  3. Step 3: Cross multiply
    620,357.16x = 856,187.10 × 378,780.60
  4. Step 4: Simplify right side
    620,357.16x = 324,307,063,450.26
  5. Step 5: Solve for x
    x = 324,307,063,450.26/620,357.16
  6. Step 6: Final answer
    x = 522,774.76

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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.