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Finding the Fourth Proportional to 518,558.60, 777,837.90 and 429,985.10

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Solution

The fourth proportional to 518,558.60, 777,837.90 and 429,985.10 is: 644,977.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    518,558.60 : 777,837.90 = 429,985.10 : x
  2. Step 2: Convert to fraction form
    518,558.60/777,837.90 = 429,985.10/x
  3. Step 3: Cross multiply
    518,558.60x = 777,837.90 × 429,985.10
  4. Step 4: Simplify right side
    518,558.60x = 334,458,707,215.29
  5. Step 5: Solve for x
    x = 334,458,707,215.29/518,558.60
  6. Step 6: Final answer
    x = 644,977.65

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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.