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Finding the Fourth Proportional to 100,699.12, 138,968.36 and 55,380.61

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Solution

The fourth proportional to 100,699.12, 138,968.36 and 55,380.61 is: 76,427.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,699.12 : 138,968.36 = 55,380.61 : x
  2. Step 2: Convert to fraction form
    100,699.12/138,968.36 = 55,380.61/x
  3. Step 3: Cross multiply
    100,699.12x = 138,968.36 × 55,380.61
  4. Step 4: Simplify right side
    100,699.12x = 7,696,152,651.98
  5. Step 5: Solve for x
    x = 7,696,152,651.98/100,699.12
  6. Step 6: Final answer
    x = 76,427.21

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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.