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Finding the Fourth Proportional to 101,722, 140,385 and 57,018.64

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Solution

The fourth proportional to 101,722, 140,385 and 57,018.64 is: 78,690.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,722 : 140,385 = 57,018.64 : x
  2. Step 2: Convert to fraction form
    101,722/140,385 = 57,018.64/x
  3. Step 3: Cross multiply
    101,722x = 140,385 × 57,018.64
  4. Step 4: Simplify right side
    101,722x = 8,004,561,776.40
  5. Step 5: Solve for x
    x = 8,004,561,776.40/101,722
  6. Step 6: Final answer
    x = 78,690.57

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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.