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Finding the Fourth Proportional to 128,994.99, 178,007.94 and 71,637.27

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Solution

The fourth proportional to 128,994.99, 178,007.94 and 71,637.27 is: 98,856.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,994.99 : 178,007.94 = 71,637.27 : x
  2. Step 2: Convert to fraction form
    128,994.99/178,007.94 = 71,637.27/x
  3. Step 3: Cross multiply
    128,994.99x = 178,007.94 × 71,637.27
  4. Step 4: Simplify right side
    128,994.99x = 12,752,002,859.92
  5. Step 5: Solve for x
    x = 12,752,002,859.92/128,994.99
  6. Step 6: Final answer
    x = 98,856.57

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.