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Finding the Fourth Proportional to 180.52, 248.79 and 139

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Solution

The fourth proportional to 180.52, 248.79 and 139 is: 191.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    180.52 : 248.79 = 139 : x
  2. Step 2: Convert to fraction form
    180.52/248.79 = 139/x
  3. Step 3: Cross multiply
    180.52x = 248.79 × 139
  4. Step 4: Simplify right side
    180.52x = 34,581.81
  5. Step 5: Solve for x
    x = 34,581.81/180.52
  6. Step 6: Final answer
    x = 191.57

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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.