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Finding the Fourth Proportional to 100,120.79, 138,164.60 and 54,797.72

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Solution

The fourth proportional to 100,120.79, 138,164.60 and 54,797.72 is: 75,619.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,120.79 : 138,164.60 = 54,797.72 : x
  2. Step 2: Convert to fraction form
    100,120.79/138,164.60 = 54,797.72/x
  3. Step 3: Cross multiply
    100,120.79x = 138,164.60 × 54,797.72
  4. Step 4: Simplify right side
    100,120.79x = 7,571,104,510.88
  5. Step 5: Solve for x
    x = 7,571,104,510.88/100,120.79
  6. Step 6: Final answer
    x = 75,619.70

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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.