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Finding the Fourth Proportional to 639,015.40, 957,356.70 and 389,405.80

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Solution

The fourth proportional to 639,015.40, 957,356.70 and 389,405.80 is: 583,397.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,015.40 : 957,356.70 = 389,405.80 : x
  2. Step 2: Convert to fraction form
    639,015.40/957,356.70 = 389,405.80/x
  3. Step 3: Cross multiply
    639,015.40x = 957,356.70 × 389,405.80
  4. Step 4: Simplify right side
    639,015.40x = 372,800,251,648.86
  5. Step 5: Solve for x
    x = 372,800,251,648.86/639,015.40
  6. Step 6: Final answer
    x = 583,397.91

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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.