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Finding the Fourth Proportional to 639,033.40, 957,383.70 and 389,423.80

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Solution

The fourth proportional to 639,033.40, 957,383.70 and 389,423.80 is: 583,424.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,033.40 : 957,383.70 = 389,423.80 : x
  2. Step 2: Convert to fraction form
    639,033.40/957,383.70 = 389,423.80/x
  3. Step 3: Cross multiply
    639,033.40x = 957,383.70 × 389,423.80
  4. Step 4: Simplify right side
    639,033.40x = 372,827,998,512.06
  5. Step 5: Solve for x
    x = 372,827,998,512.06/639,033.40
  6. Step 6: Final answer
    x = 583,424.90

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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.