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Finding the Fourth Proportional to 101,129.54, 139,552.74 and 55,811.78

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Solution

The fourth proportional to 101,129.54, 139,552.74 and 55,811.78 is: 77,016.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,129.54 : 139,552.74 = 55,811.78 : x
  2. Step 2: Convert to fraction form
    101,129.54/139,552.74 = 55,811.78/x
  3. Step 3: Cross multiply
    101,129.54x = 139,552.74 × 55,811.78
  4. Step 4: Simplify right side
    101,129.54x = 7,788,686,648.84
  5. Step 5: Solve for x
    x = 7,788,686,648.84/101,129.54
  6. Step 6: Final answer
    x = 77,016.93

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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.