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Finding the Fourth Proportional to 1,490.78, 2,236.98 and 758.54

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Solution

The fourth proportional to 1,490.78, 2,236.98 and 758.54 is: 1,138.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,490.78 : 2,236.98 = 758.54 : x
  2. Step 2: Convert to fraction form
    1,490.78/2,236.98 = 758.54/x
  3. Step 3: Cross multiply
    1,490.78x = 2,236.98 × 758.54
  4. Step 4: Simplify right side
    1,490.78x = 1,696,838.81
  5. Step 5: Solve for x
    x = 1,696,838.81/1,490.78
  6. Step 6: Final answer
    x = 1,138.22

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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.