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Finding the Fourth Proportional to 691,761.75, 954,631.22 and 389,955.75

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Solution

The fourth proportional to 691,761.75, 954,631.22 and 389,955.75 is: 538,138.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    691,761.75 : 954,631.22 = 389,955.75 : x
  2. Step 2: Convert to fraction form
    691,761.75/954,631.22 = 389,955.75/x
  3. Step 3: Cross multiply
    691,761.75x = 954,631.22 × 389,955.75
  4. Step 4: Simplify right side
    691,761.75x = 372,263,931,418.74
  5. Step 5: Solve for x
    x = 372,263,931,418.74/691,761.75
  6. Step 6: Final answer
    x = 538,138.94

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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.