Home / 405,826.80-608,740.20-398,828.40

Finding the Fourth Proportional to 405,826.80, 608,740.20 and 398,828.40

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Solution

The fourth proportional to 405,826.80, 608,740.20 and 398,828.40 is: 598,242.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,826.80 : 608,740.20 = 398,828.40 : x
  2. Step 2: Convert to fraction form
    405,826.80/608,740.20 = 398,828.40/x
  3. Step 3: Cross multiply
    405,826.80x = 608,740.20 × 398,828.40
  4. Step 4: Simplify right side
    405,826.80x = 242,782,879,981.68
  5. Step 5: Solve for x
    x = 242,782,879,981.68/405,826.80
  6. Step 6: Final answer
    x = 598,242.60

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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.