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Finding the Fourth Proportional to 101,085.42, 139,409.26 and 80,934.95

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Solution

The fourth proportional to 101,085.42, 139,409.26 and 80,934.95 is: 111,619.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,085.42 : 139,409.26 = 80,934.95 : x
  2. Step 2: Convert to fraction form
    101,085.42/139,409.26 = 80,934.95/x
  3. Step 3: Cross multiply
    101,085.42x = 139,409.26 × 80,934.95
  4. Step 4: Simplify right side
    101,085.42x = 11,283,081,633.82
  5. Step 5: Solve for x
    x = 11,283,081,633.82/101,085.42
  6. Step 6: Final answer
    x = 111,619.28

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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.