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Finding the Fourth Proportional to 100,489.44, 138,680.88 and 55,778.40

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Solution

The fourth proportional to 100,489.44, 138,680.88 and 55,778.40 is: 76,977.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,489.44 : 138,680.88 = 55,778.40 : x
  2. Step 2: Convert to fraction form
    100,489.44/138,680.88 = 55,778.40/x
  3. Step 3: Cross multiply
    100,489.44x = 138,680.88 × 55,778.40
  4. Step 4: Simplify right side
    100,489.44x = 7,735,397,596.99
  5. Step 5: Solve for x
    x = 7,735,397,596.99/100,489.44
  6. Step 6: Final answer
    x = 76,977.22

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1.5x scale

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.