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Finding the Fourth Proportional to 1,260.40, 1,891.46 and 438.66

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Solution

The fourth proportional to 1,260.40, 1,891.46 and 438.66 is: 658.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,260.40 : 1,891.46 = 438.66 : x
  2. Step 2: Convert to fraction form
    1,260.40/1,891.46 = 438.66/x
  3. Step 3: Cross multiply
    1,260.40x = 1,891.46 × 438.66
  4. Step 4: Simplify right side
    1,260.40x = 829,705.65
  5. Step 5: Solve for x
    x = 829,705.65/1,260.40
  6. Step 6: Final answer
    x = 658.29

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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.