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Finding the Fourth Proportional to 639,387.60, 957,817.80 and 414,904.20

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Solution

The fourth proportional to 639,387.60, 957,817.80 and 414,904.20 is: 621,536.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,387.60 : 957,817.80 = 414,904.20 : x
  2. Step 2: Convert to fraction form
    639,387.60/957,817.80 = 414,904.20/x
  3. Step 3: Cross multiply
    639,387.60x = 957,817.80 × 414,904.20
  4. Step 4: Simplify right side
    639,387.60x = 397,402,628,054.76
  5. Step 5: Solve for x
    x = 397,402,628,054.76/639,387.60
  6. Step 6: Final answer
    x = 621,536.34

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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.