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Finding the Fourth Proportional to 612,935.40, 919,403.10 and 280,511.40

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Solution

The fourth proportional to 612,935.40, 919,403.10 and 280,511.40 is: 420,767.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,935.40 : 919,403.10 = 280,511.40 : x
  2. Step 2: Convert to fraction form
    612,935.40/919,403.10 = 280,511.40/x
  3. Step 3: Cross multiply
    612,935.40x = 919,403.10 × 280,511.40
  4. Step 4: Simplify right side
    612,935.40x = 257,903,050,745.34
  5. Step 5: Solve for x
    x = 257,903,050,745.34/612,935.40
  6. Step 6: Final answer
    x = 420,767.10

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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.