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Finding the Fourth Proportional to 101,102.79, 139,520.97 and 55,781.19

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Solution

The fourth proportional to 101,102.79, 139,520.97 and 55,781.19 is: 76,977.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,102.79 : 139,520.97 = 55,781.19 : x
  2. Step 2: Convert to fraction form
    101,102.79/139,520.97 = 55,781.19/x
  3. Step 3: Cross multiply
    101,102.79x = 139,520.97 × 55,781.19
  4. Step 4: Simplify right side
    101,102.79x = 7,782,645,736.55
  5. Step 5: Solve for x
    x = 7,782,645,736.55/101,102.79
  6. Step 6: Final answer
    x = 76,977.56

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1.5x scale

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.