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Finding the Fourth Proportional to 621,808.20, 932,712.30 and 397,859.40

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Solution

The fourth proportional to 621,808.20, 932,712.30 and 397,859.40 is: 596,789.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    621,808.20 : 932,712.30 = 397,859.40 : x
  2. Step 2: Convert to fraction form
    621,808.20/932,712.30 = 397,859.40/x
  3. Step 3: Cross multiply
    621,808.20x = 932,712.30 × 397,859.40
  4. Step 4: Simplify right side
    621,808.20x = 371,088,356,050.62
  5. Step 5: Solve for x
    x = 371,088,356,050.62/621,808.20
  6. Step 6: Final answer
    x = 596,789.10

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Double scale
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Similar ratio
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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.