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Finding the Fourth Proportional to 185.98, 256.99 and 139.51

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Solution

The fourth proportional to 185.98, 256.99 and 139.51 is: 192.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    185.98 : 256.99 = 139.51 : x
  2. Step 2: Convert to fraction form
    185.98/256.99 = 139.51/x
  3. Step 3: Cross multiply
    185.98x = 256.99 × 139.51
  4. Step 4: Simplify right side
    185.98x = 35,852.67
  5. Step 5: Solve for x
    x = 35,852.67/185.98
  6. Step 6: Final answer
    x = 192.78

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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.