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Finding the Fourth Proportional to 615,903.40, 923,855.10 and 405,778.60

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Solution

The fourth proportional to 615,903.40, 923,855.10 and 405,778.60 is: 608,667.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    615,903.40 : 923,855.10 = 405,778.60 : x
  2. Step 2: Convert to fraction form
    615,903.40/923,855.10 = 405,778.60/x
  3. Step 3: Cross multiply
    615,903.40x = 923,855.10 × 405,778.60
  4. Step 4: Simplify right side
    615,903.40x = 374,880,629,080.86
  5. Step 5: Solve for x
    x = 374,880,629,080.86/615,903.40
  6. Step 6: Final answer
    x = 608,667.90

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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.