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Finding the Fourth Proportional to 128,158.72, 192,102 and 75,592.96

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Solution

The fourth proportional to 128,158.72, 192,102 and 75,592.96 is: 113,309.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,158.72 : 192,102 = 75,592.96 : x
  2. Step 2: Convert to fraction form
    128,158.72/192,102 = 75,592.96/x
  3. Step 3: Cross multiply
    128,158.72x = 192,102 × 75,592.96
  4. Step 4: Simplify right side
    128,158.72x = 14,521,558,801.92
  5. Step 5: Solve for x
    x = 14,521,558,801.92/128,158.72
  6. Step 6: Final answer
    x = 113,309.17

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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.