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Finding the Fourth Proportional to 128,529.68, 192,459.15 and 103,432.64

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Solution

The fourth proportional to 128,529.68, 192,459.15 and 103,432.64 is: 154,879.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,529.68 : 192,459.15 = 103,432.64 : x
  2. Step 2: Convert to fraction form
    128,529.68/192,459.15 = 103,432.64/x
  3. Step 3: Cross multiply
    128,529.68x = 192,459.15 × 103,432.64
  4. Step 4: Simplify right side
    128,529.68x = 19,906,557,014.36
  5. Step 5: Solve for x
    x = 19,906,557,014.36/128,529.68
  6. Step 6: Final answer
    x = 154,879.07

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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.