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Finding the Fourth Proportional to 128,828, 177,722.16 and 91,123.04

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Solution

The fourth proportional to 128,828, 177,722.16 and 91,123.04 is: 125,707.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,828 : 177,722.16 = 91,123.04 : x
  2. Step 2: Convert to fraction form
    128,828/177,722.16 = 91,123.04/x
  3. Step 3: Cross multiply
    128,828x = 177,722.16 × 91,123.04
  4. Step 4: Simplify right side
    128,828x = 16,194,583,494.57
  5. Step 5: Solve for x
    x = 16,194,583,494.57/128,828
  6. Step 6: Final answer
    x = 125,707.02

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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.