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Finding the Fourth Proportional to 100,979.69, 139,352.85 and 55,659.27

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Solution

The fourth proportional to 100,979.69, 139,352.85 and 55,659.27 is: 76,810.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,979.69 : 139,352.85 = 55,659.27 : x
  2. Step 2: Convert to fraction form
    100,979.69/139,352.85 = 55,659.27/x
  3. Step 3: Cross multiply
    100,979.69x = 139,352.85 × 55,659.27
  4. Step 4: Simplify right side
    100,979.69x = 7,756,277,903.42
  5. Step 5: Solve for x
    x = 7,756,277,903.42/100,979.69
  6. Step 6: Final answer
    x = 76,810.28

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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.