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Finding the Fourth Proportional to 101,128.94, 139,682.11 and 75,748.72

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Solution

The fourth proportional to 101,128.94, 139,682.11 and 75,748.72 is: 104,626.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,128.94 : 139,682.11 = 75,748.72 : x
  2. Step 2: Convert to fraction form
    101,128.94/139,682.11 = 75,748.72/x
  3. Step 3: Cross multiply
    101,128.94x = 139,682.11 × 75,748.72
  4. Step 4: Simplify right side
    101,128.94x = 10,580,740,340.99
  5. Step 5: Solve for x
    x = 10,580,740,340.99/101,128.94
  6. Step 6: Final answer
    x = 104,626.24

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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.