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Finding the Fourth Proportional to 1,255.75, 1,883.67 and 390.04

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Solution

The fourth proportional to 1,255.75, 1,883.67 and 390.04 is: 585.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,255.75 : 1,883.67 = 390.04 : x
  2. Step 2: Convert to fraction form
    1,255.75/1,883.67 = 390.04/x
  3. Step 3: Cross multiply
    1,255.75x = 1,883.67 × 390.04
  4. Step 4: Simplify right side
    1,255.75x = 734,706.65
  5. Step 5: Solve for x
    x = 734,706.65/1,255.75
  6. Step 6: Final answer
    x = 585.07

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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.