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Finding the Fourth Proportional to 1,490.82, 2,236.37 and 613.14

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Solution

The fourth proportional to 1,490.82, 2,236.37 and 613.14 is: 919.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,490.82 : 2,236.37 = 613.14 : x
  2. Step 2: Convert to fraction form
    1,490.82/2,236.37 = 613.14/x
  3. Step 3: Cross multiply
    1,490.82x = 2,236.37 × 613.14
  4. Step 4: Simplify right side
    1,490.82x = 1,371,204.84
  5. Step 5: Solve for x
    x = 1,371,204.84/1,490.82
  6. Step 6: Final answer
    x = 919.77

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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.