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Finding the Fourth Proportional to 691,987.90, 954,921.63 and 405,698.65

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Solution

The fourth proportional to 691,987.90, 954,921.63 and 405,698.65 is: 559,851.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    691,987.90 : 954,921.63 = 405,698.65 : x
  2. Step 2: Convert to fraction form
    691,987.90/954,921.63 = 405,698.65/x
  3. Step 3: Cross multiply
    691,987.90x = 954,921.63 × 405,698.65
  4. Step 4: Simplify right side
    691,987.90x = 387,410,416,146.80
  5. Step 5: Solve for x
    x = 387,410,416,146.80/691,987.90
  6. Step 6: Final answer
    x = 559,851.43

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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.