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Finding the Fourth Proportional to 100,711.08, 138,978.36 and 55,388.88

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Solution

The fourth proportional to 100,711.08, 138,978.36 and 55,388.88 is: 76,435.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,711.08 : 138,978.36 = 55,388.88 : x
  2. Step 2: Convert to fraction form
    100,711.08/138,978.36 = 55,388.88/x
  3. Step 3: Cross multiply
    100,711.08x = 138,978.36 × 55,388.88
  4. Step 4: Simplify right side
    100,711.08x = 7,697,855,704.64
  5. Step 5: Solve for x
    x = 7,697,855,704.64/100,711.08
  6. Step 6: Final answer
    x = 76,435.04

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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.