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Finding the Fourth Proportional to 255.30, 352.32 and 138.87

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Solution

The fourth proportional to 255.30, 352.32 and 138.87 is: 191.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.30 : 352.32 = 138.87 : x
  2. Step 2: Convert to fraction form
    255.30/352.32 = 138.87/x
  3. Step 3: Cross multiply
    255.30x = 352.32 × 138.87
  4. Step 4: Simplify right side
    255.30x = 48,925.95
  5. Step 5: Solve for x
    x = 48,925.95/255.30
  6. Step 6: Final answer
    x = 191.64

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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.