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Finding the Fourth Proportional to 1,318.67, 1,978.27 and 908

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Solution

The fourth proportional to 1,318.67, 1,978.27 and 908 is: 1,362.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,318.67 : 1,978.27 = 908 : x
  2. Step 2: Convert to fraction form
    1,318.67/1,978.27 = 908/x
  3. Step 3: Cross multiply
    1,318.67x = 1,978.27 × 908
  4. Step 4: Simplify right side
    1,318.67x = 1,796,269.16
  5. Step 5: Solve for x
    x = 1,796,269.16/1,318.67
  6. Step 6: Final answer
    x = 1,362.18

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.