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Finding the Fourth Proportional to 185.98, 256.37 and 139.28

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Solution

The fourth proportional to 185.98, 256.37 and 139.28 is: 191.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    185.98 : 256.37 = 139.28 : x
  2. Step 2: Convert to fraction form
    185.98/256.37 = 139.28/x
  3. Step 3: Cross multiply
    185.98x = 256.37 × 139.28
  4. Step 4: Simplify right side
    185.98x = 35,707.21
  5. Step 5: Solve for x
    x = 35,707.21/185.98
  6. Step 6: Final answer
    x = 191.99

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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.