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Finding the Fourth Proportional to 1,318.89, 1,978.53 and 799.29

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Solution

The fourth proportional to 1,318.89, 1,978.53 and 799.29 is: 1,199.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,318.89 : 1,978.53 = 799.29 : x
  2. Step 2: Convert to fraction form
    1,318.89/1,978.53 = 799.29/x
  3. Step 3: Cross multiply
    1,318.89x = 1,978.53 × 799.29
  4. Step 4: Simplify right side
    1,318.89x = 1,581,419.24
  5. Step 5: Solve for x
    x = 1,581,419.24/1,318.89
  6. Step 6: Final answer
    x = 1,199.05

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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.