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Finding the Fourth Proportional to 128,506, 177,447.72 and 80,839.12

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Solution

The fourth proportional to 128,506, 177,447.72 and 80,839.12 is: 111,626.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,506 : 177,447.72 = 80,839.12 : x
  2. Step 2: Convert to fraction form
    128,506/177,447.72 = 80,839.12/x
  3. Step 3: Cross multiply
    128,506x = 177,447.72 × 80,839.12
  4. Step 4: Simplify right side
    128,506x = 14,344,717,530.81
  5. Step 5: Solve for x
    x = 14,344,717,530.81/128,506
  6. Step 6: Final answer
    x = 111,626.83

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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.