Home / 128,981.06-177,991.35-71,617.40

Finding the Fourth Proportional to 128,981.06, 177,991.35 and 71,617.40

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Solution

The fourth proportional to 128,981.06, 177,991.35 and 71,617.40 is: 98,830.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,981.06 : 177,991.35 = 71,617.40 : x
  2. Step 2: Convert to fraction form
    128,981.06/177,991.35 = 71,617.40/x
  3. Step 3: Cross multiply
    128,981.06x = 177,991.35 × 71,617.40
  4. Step 4: Simplify right side
    128,981.06x = 12,747,276,819.53
  5. Step 5: Solve for x
    x = 12,747,276,819.53/128,981.06
  6. Step 6: Final answer
    x = 98,830.61

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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.