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Finding the Fourth Proportional to 1,141.31, 1,711.96 and 319.60

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Solution

The fourth proportional to 1,141.31, 1,711.96 and 319.60 is: 479.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,141.31 : 1,711.96 = 319.60 : x
  2. Step 2: Convert to fraction form
    1,141.31/1,711.96 = 319.60/x
  3. Step 3: Cross multiply
    1,141.31x = 1,711.96 × 319.60
  4. Step 4: Simplify right side
    1,141.31x = 547,149.47
  5. Step 5: Solve for x
    x = 547,149.47/1,141.31
  6. Step 6: Final answer
    x = 479.41

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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.