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Finding the Fourth Proportional to 138,171.40, 207,257.10 and 135,099.40

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Solution

The fourth proportional to 138,171.40, 207,257.10 and 135,099.40 is: 202,649.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,171.40 : 207,257.10 = 135,099.40 : x
  2. Step 2: Convert to fraction form
    138,171.40/207,257.10 = 135,099.40/x
  3. Step 3: Cross multiply
    138,171.40x = 207,257.10 × 135,099.40
  4. Step 4: Simplify right side
    138,171.40x = 28,000,309,855.74
  5. Step 5: Solve for x
    x = 28,000,309,855.74/138,171.40
  6. Step 6: Final answer
    x = 202,649.10

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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.