Home / 639,056.40-957,418.20-389,446.80

Finding the Fourth Proportional to 639,056.40, 957,418.20 and 389,446.80

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Solution

The fourth proportional to 639,056.40, 957,418.20 and 389,446.80 is: 583,459.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,056.40 : 957,418.20 = 389,446.80 : x
  2. Step 2: Convert to fraction form
    639,056.40/957,418.20 = 389,446.80/x
  3. Step 3: Cross multiply
    639,056.40x = 957,418.20 × 389,446.80
  4. Step 4: Simplify right side
    639,056.40x = 372,863,454,251.76
  5. Step 5: Solve for x
    x = 372,863,454,251.76/639,056.40
  6. Step 6: Final answer
    x = 583,459.39

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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.