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Finding the Fourth Proportional to 691,742.12, 954,605.70 and 389,936.12

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Solution

The fourth proportional to 691,742.12, 954,605.70 and 389,936.12 is: 538,112.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    691,742.12 : 954,605.70 = 389,936.12 : x
  2. Step 2: Convert to fraction form
    691,742.12/954,605.70 = 389,936.12/x
  3. Step 3: Cross multiply
    691,742.12x = 954,605.70 × 389,936.12
  4. Step 4: Simplify right side
    691,742.12x = 372,235,242,787.88
  5. Step 5: Solve for x
    x = 372,235,242,787.88/691,742.12
  6. Step 6: Final answer
    x = 538,112.73

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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.