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Finding the Fourth Proportional to 1,490.93, 2,236.40 and 878.90

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Solution

The fourth proportional to 1,490.93, 2,236.40 and 878.90 is: 1,318.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,490.93 : 2,236.40 = 878.90 : x
  2. Step 2: Convert to fraction form
    1,490.93/2,236.40 = 878.90/x
  3. Step 3: Cross multiply
    1,490.93x = 2,236.40 × 878.90
  4. Step 4: Simplify right side
    1,490.93x = 1,965,571.96
  5. Step 5: Solve for x
    x = 1,965,571.96/1,490.93
  6. Step 6: Final answer
    x = 1,318.35

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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.