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Finding the Fourth Proportional to 1,255.91, 1,883.84 and 390.22

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Solution

The fourth proportional to 1,255.91, 1,883.84 and 390.22 is: 585.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,255.91 : 1,883.84 = 390.22 : x
  2. Step 2: Convert to fraction form
    1,255.91/1,883.84 = 390.22/x
  3. Step 3: Cross multiply
    1,255.91x = 1,883.84 × 390.22
  4. Step 4: Simplify right side
    1,255.91x = 735,112.04
  5. Step 5: Solve for x
    x = 735,112.04/1,255.91
  6. Step 6: Final answer
    x = 585.32

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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.