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Finding the Fourth Proportional to 405,645.30, 607,301.55 and 393,981.30

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Solution

The fourth proportional to 405,645.30, 607,301.55 and 393,981.30 is: 589,839.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,645.30 : 607,301.55 = 393,981.30 : x
  2. Step 2: Convert to fraction form
    405,645.30/607,301.55 = 393,981.30/x
  3. Step 3: Cross multiply
    405,645.30x = 607,301.55 × 393,981.30
  4. Step 4: Simplify right side
    405,645.30x = 239,265,454,161.02
  5. Step 5: Solve for x
    x = 239,265,454,161.02/405,645.30
  6. Step 6: Final answer
    x = 589,839.09

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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.