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Finding the Fourth Proportional to 101,959.88, 140,699.88 and 56,640.80

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Solution

The fourth proportional to 101,959.88, 140,699.88 and 56,640.80 is: 78,161.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,959.88 : 140,699.88 = 56,640.80 : x
  2. Step 2: Convert to fraction form
    101,959.88/140,699.88 = 56,640.80/x
  3. Step 3: Cross multiply
    101,959.88x = 140,699.88 × 56,640.80
  4. Step 4: Simplify right side
    101,959.88x = 7,969,353,763.10
  5. Step 5: Solve for x
    x = 7,969,353,763.10/101,959.88
  6. Step 6: Final answer
    x = 78,161.66

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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.