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Finding the Fourth Proportional to 1,296.28, 1,787.70 and 830.44

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Solution

The fourth proportional to 1,296.28, 1,787.70 and 830.44 is: 1,145.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,296.28 : 1,787.70 = 830.44 : x
  2. Step 2: Convert to fraction form
    1,296.28/1,787.70 = 830.44/x
  3. Step 3: Cross multiply
    1,296.28x = 1,787.70 × 830.44
  4. Step 4: Simplify right side
    1,296.28x = 1,484,577.59
  5. Step 5: Solve for x
    x = 1,484,577.59/1,296.28
  6. Step 6: Final answer
    x = 1,145.26

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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.