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Finding the Fourth Proportional to 100,979.60, 151,469.40 and 85,427.60

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Solution

The fourth proportional to 100,979.60, 151,469.40 and 85,427.60 is: 128,141.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,979.60 : 151,469.40 = 85,427.60 : x
  2. Step 2: Convert to fraction form
    100,979.60/151,469.40 = 85,427.60/x
  3. Step 3: Cross multiply
    100,979.60x = 151,469.40 × 85,427.60
  4. Step 4: Simplify right side
    100,979.60x = 12,939,667,315.44
  5. Step 5: Solve for x
    x = 12,939,667,315.44/100,979.60
  6. Step 6: Final answer
    x = 128,141.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.