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Finding the Fourth Proportional to 185.63, 256.18 and 138.92

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Solution

The fourth proportional to 185.63, 256.18 and 138.92 is: 191.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    185.63 : 256.18 = 138.92 : x
  2. Step 2: Convert to fraction form
    185.63/256.18 = 138.92/x
  3. Step 3: Cross multiply
    185.63x = 256.18 × 138.92
  4. Step 4: Simplify right side
    185.63x = 35,587.24
  5. Step 5: Solve for x
    x = 35,587.24/185.63
  6. Step 6: Final answer
    x = 191.72

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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.