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Finding the Fourth Proportional to 405,616.60, 608,424.90 and 256,025.80

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Solution

The fourth proportional to 405,616.60, 608,424.90 and 256,025.80 is: 384,038.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,616.60 : 608,424.90 = 256,025.80 : x
  2. Step 2: Convert to fraction form
    405,616.60/608,424.90 = 256,025.80/x
  3. Step 3: Cross multiply
    405,616.60x = 608,424.90 × 256,025.80
  4. Step 4: Simplify right side
    405,616.60x = 155,772,471,762.42
  5. Step 5: Solve for x
    x = 155,772,471,762.42/405,616.60
  6. Step 6: Final answer
    x = 384,038.70

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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.