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Finding the Fourth Proportional to 128,307.96, 192,086.64 and 74,836.44

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Solution

The fourth proportional to 128,307.96, 192,086.64 and 74,836.44 is: 112,035.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,307.96 : 192,086.64 = 74,836.44 : x
  2. Step 2: Convert to fraction form
    128,307.96/192,086.64 = 74,836.44/x
  3. Step 3: Cross multiply
    128,307.96x = 192,086.64 × 74,836.44
  4. Step 4: Simplify right side
    128,307.96x = 14,375,080,309.16
  5. Step 5: Solve for x
    x = 14,375,080,309.16/128,307.96
  6. Step 6: Final answer
    x = 112,035.76

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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.