Home / 128,748.48-177,678.92-80,379.04

Finding the Fourth Proportional to 128,748.48, 177,678.92 and 80,379.04

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Solution

The fourth proportional to 128,748.48, 177,678.92 and 80,379.04 is: 110,926.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,748.48 : 177,678.92 = 80,379.04 : x
  2. Step 2: Convert to fraction form
    128,748.48/177,678.92 = 80,379.04/x
  3. Step 3: Cross multiply
    128,748.48x = 177,678.92 × 80,379.04
  4. Step 4: Simplify right side
    128,748.48x = 14,281,661,017.84
  5. Step 5: Solve for x
    x = 14,281,661,017.84/128,748.48
  6. Step 6: Final answer
    x = 110,926.83

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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.