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Finding the Fourth Proportional to 1,279.73, 1,916.81 and 784.64

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Solution

The fourth proportional to 1,279.73, 1,916.81 and 784.64 is: 1,175.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.73 : 1,916.81 = 784.64 : x
  2. Step 2: Convert to fraction form
    1,279.73/1,916.81 = 784.64/x
  3. Step 3: Cross multiply
    1,279.73x = 1,916.81 × 784.64
  4. Step 4: Simplify right side
    1,279.73x = 1,504,012.55
  5. Step 5: Solve for x
    x = 1,504,012.55/1,279.73
  6. Step 6: Final answer
    x = 1,175.26

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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.