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Finding the Fourth Proportional to 1,076.31, 1,613.84 and 345.69

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Solution

The fourth proportional to 1,076.31, 1,613.84 and 345.69 is: 518.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,076.31 : 1,613.84 = 345.69 : x
  2. Step 2: Convert to fraction form
    1,076.31/1,613.84 = 345.69/x
  3. Step 3: Cross multiply
    1,076.31x = 1,613.84 × 345.69
  4. Step 4: Simplify right side
    1,076.31x = 557,886.62
  5. Step 5: Solve for x
    x = 557,886.62/1,076.31
  6. Step 6: Final answer
    x = 518.33

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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.