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Finding the Fourth Proportional to 964.87, 1,447.71 and 618.40

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Solution

The fourth proportional to 964.87, 1,447.71 and 618.40 is: 927.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    964.87 : 1,447.71 = 618.40 : x
  2. Step 2: Convert to fraction form
    964.87/1,447.71 = 618.40/x
  3. Step 3: Cross multiply
    964.87x = 1,447.71 × 618.40
  4. Step 4: Simplify right side
    964.87x = 895,260.43
  5. Step 5: Solve for x
    x = 895,260.43/964.87
  6. Step 6: Final answer
    x = 927.85

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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.