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Finding the Fourth Proportional to 1,308.78, 1,963.29 and 1,115.19

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Solution

The fourth proportional to 1,308.78, 1,963.29 and 1,115.19 is: 1,672.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,308.78 : 1,963.29 = 1,115.19 : x
  2. Step 2: Convert to fraction form
    1,308.78/1,963.29 = 1,115.19/x
  3. Step 3: Cross multiply
    1,308.78x = 1,963.29 × 1,115.19
  4. Step 4: Simplify right side
    1,308.78x = 2,189,441.38
  5. Step 5: Solve for x
    x = 2,189,441.38/1,308.78
  6. Step 6: Final answer
    x = 1,672.89

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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.