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Finding the Fourth Proportional to 691,755, 954,636.50 and 389,949

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Solution

The fourth proportional to 691,755, 954,636.50 and 389,949 is: 538,137.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    691,755 : 954,636.50 = 389,949 : x
  2. Step 2: Convert to fraction form
    691,755/954,636.50 = 389,949/x
  3. Step 3: Cross multiply
    691,755x = 954,636.50 × 389,949
  4. Step 4: Simplify right side
    691,755x = 372,259,548,538.50
  5. Step 5: Solve for x
    x = 372,259,548,538.50/691,755
  6. Step 6: Final answer
    x = 538,137.85

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.