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Finding the Fourth Proportional to 290.32, 400.56 and 255.68

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Solution

The fourth proportional to 290.32, 400.56 and 255.68 is: 352.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    290.32 : 400.56 = 255.68 : x
  2. Step 2: Convert to fraction form
    290.32/400.56 = 255.68/x
  3. Step 3: Cross multiply
    290.32x = 400.56 × 255.68
  4. Step 4: Simplify right side
    290.32x = 102,415.18
  5. Step 5: Solve for x
    x = 102,415.18/290.32
  6. Step 6: Final answer
    x = 352.77

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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.