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Finding the Fourth Proportional to 138,343.60, 207,709.80 and 85,855.60

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Solution

The fourth proportional to 138,343.60, 207,709.80 and 85,855.60 is: 128,904.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,343.60 : 207,709.80 = 85,855.60 : x
  2. Step 2: Convert to fraction form
    138,343.60/207,709.80 = 85,855.60/x
  3. Step 3: Cross multiply
    138,343.60x = 207,709.80 × 85,855.60
  4. Step 4: Simplify right side
    138,343.60x = 17,833,049,504.88
  5. Step 5: Solve for x
    x = 17,833,049,504.88/138,343.60
  6. Step 6: Final answer
    x = 128,904.04

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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.