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Finding the Fourth Proportional to 1,238.75, 1,709.88 and 890.45

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Solution

The fourth proportional to 1,238.75, 1,709.88 and 890.45 is: 1,229.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,238.75 : 1,709.88 = 890.45 : x
  2. Step 2: Convert to fraction form
    1,238.75/1,709.88 = 890.45/x
  3. Step 3: Cross multiply
    1,238.75x = 1,709.88 × 890.45
  4. Step 4: Simplify right side
    1,238.75x = 1,522,562.65
  5. Step 5: Solve for x
    x = 1,522,562.65/1,238.75
  6. Step 6: Final answer
    x = 1,229.11

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.