Home / 128,981.99-177,992.61-71,618.36

Finding the Fourth Proportional to 128,981.99, 177,992.61 and 71,618.36

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Solution

The fourth proportional to 128,981.99, 177,992.61 and 71,618.36 is: 98,831.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,981.99 : 177,992.61 = 71,618.36 : x
  2. Step 2: Convert to fraction form
    128,981.99/177,992.61 = 71,618.36/x
  3. Step 3: Cross multiply
    128,981.99x = 177,992.61 × 71,618.36
  4. Step 4: Simplify right side
    128,981.99x = 12,747,537,930.36
  5. Step 5: Solve for x
    x = 12,747,537,930.36/128,981.99
  6. Step 6: Final answer
    x = 98,831.93

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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.