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Finding the Fourth Proportional to 639,057.40, 957,419.70 and 389,447.80

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Solution

The fourth proportional to 639,057.40, 957,419.70 and 389,447.80 is: 583,460.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,057.40 : 957,419.70 = 389,447.80 : x
  2. Step 2: Convert to fraction form
    639,057.40/957,419.70 = 389,447.80/x
  3. Step 3: Cross multiply
    639,057.40x = 957,419.70 × 389,447.80
  4. Step 4: Simplify right side
    639,057.40x = 372,864,995,841.66
  5. Step 5: Solve for x
    x = 372,864,995,841.66/639,057.40
  6. Step 6: Final answer
    x = 583,460.88

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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.