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Finding the Fourth Proportional to 639,081.40, 957,455.70 and 520,108.60

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Solution

The fourth proportional to 639,081.40, 957,455.70 and 520,108.60 is: 779,213.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,081.40 : 957,455.70 = 520,108.60 : x
  2. Step 2: Convert to fraction form
    639,081.40/957,455.70 = 520,108.60/x
  3. Step 3: Cross multiply
    639,081.40x = 957,455.70 × 520,108.60
  4. Step 4: Simplify right side
    639,081.40x = 497,980,943,689.02
  5. Step 5: Solve for x
    x = 497,980,943,689.02/639,081.40
  6. Step 6: Final answer
    x = 779,213.64

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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.