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Finding the Fourth Proportional to 639,381.60, 881,804.88 and 384,685.20

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Solution

The fourth proportional to 639,381.60, 881,804.88 and 384,685.20 is: 530,539.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,381.60 : 881,804.88 = 384,685.20 : x
  2. Step 2: Convert to fraction form
    639,381.60/881,804.88 = 384,685.20/x
  3. Step 3: Cross multiply
    639,381.60x = 881,804.88 × 384,685.20
  4. Step 4: Simplify right side
    639,381.60x = 339,217,286,623.78
  5. Step 5: Solve for x
    x = 339,217,286,623.78/639,381.60
  6. Step 6: Final answer
    x = 530,539.64

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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.