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Finding the Fourth Proportional to 101,310.78, 139,811.67 and 55,991.70

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Solution

The fourth proportional to 101,310.78, 139,811.67 and 55,991.70 is: 77,270.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,310.78 : 139,811.67 = 55,991.70 : x
  2. Step 2: Convert to fraction form
    101,310.78/139,811.67 = 55,991.70/x
  3. Step 3: Cross multiply
    101,310.78x = 139,811.67 × 55,991.70
  4. Step 4: Simplify right side
    101,310.78x = 7,828,293,083.14
  5. Step 5: Solve for x
    x = 7,828,293,083.14/101,310.78
  6. Step 6: Final answer
    x = 77,270.09

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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.