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Finding the Fourth Proportional to 639,476.20, 957,371.10 and 390,644.20

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Solution

The fourth proportional to 639,476.20, 957,371.10 and 390,644.20 is: 584,840.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,476.20 : 957,371.10 = 390,644.20 : x
  2. Step 2: Convert to fraction form
    639,476.20/957,371.10 = 390,644.20/x
  3. Step 3: Cross multiply
    639,476.20x = 957,371.10 × 390,644.20
  4. Step 4: Simplify right side
    639,476.20x = 373,991,467,462.62
  5. Step 5: Solve for x
    x = 373,991,467,462.62/639,476.20
  6. Step 6: Final answer
    x = 584,840.32

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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.