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Finding the Fourth Proportional to 101,128.90, 140,147.81 and 99,701.88

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Solution

The fourth proportional to 101,128.90, 140,147.81 and 99,701.88 is: 138,170.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,128.90 : 140,147.81 = 99,701.88 : x
  2. Step 2: Convert to fraction form
    101,128.90/140,147.81 = 99,701.88/x
  3. Step 3: Cross multiply
    101,128.90x = 140,147.81 × 99,701.88
  4. Step 4: Simplify right side
    101,128.90x = 13,972,999,636.37
  5. Step 5: Solve for x
    x = 13,972,999,636.37/101,128.90
  6. Step 6: Final answer
    x = 138,170.19

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.