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Finding the Fourth Proportional to 1,318.82, 1,978.43 and 1,154.79

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Solution

The fourth proportional to 1,318.82, 1,978.43 and 1,154.79 is: 1,732.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,318.82 : 1,978.43 = 1,154.79 : x
  2. Step 2: Convert to fraction form
    1,318.82/1,978.43 = 1,154.79/x
  3. Step 3: Cross multiply
    1,318.82x = 1,978.43 × 1,154.79
  4. Step 4: Simplify right side
    1,318.82x = 2,284,665.41
  5. Step 5: Solve for x
    x = 2,284,665.41/1,318.82
  6. Step 6: Final answer
    x = 1,732.36

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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.