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Finding the Fourth Proportional to 1,959.29, 2,938.97 and 918.71

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Solution

The fourth proportional to 1,959.29, 2,938.97 and 918.71 is: 1,378.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,959.29 : 2,938.97 = 918.71 : x
  2. Step 2: Convert to fraction form
    1,959.29/2,938.97 = 918.71/x
  3. Step 3: Cross multiply
    1,959.29x = 2,938.97 × 918.71
  4. Step 4: Simplify right side
    1,959.29x = 2,700,063.88
  5. Step 5: Solve for x
    x = 2,700,063.88/1,959.29
  6. Step 6: Final answer
    x = 1,378.09

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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.