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Finding the Fourth Proportional to 128,706.67, 177,615.26 and 78,405.67

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Solution

The fourth proportional to 128,706.67, 177,615.26 and 78,405.67 is: 108,199.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,706.67 : 177,615.26 = 78,405.67 : x
  2. Step 2: Convert to fraction form
    128,706.67/177,615.26 = 78,405.67/x
  3. Step 3: Cross multiply
    128,706.67x = 177,615.26 × 78,405.67
  4. Step 4: Simplify right side
    128,706.67x = 13,926,043,462.52
  5. Step 5: Solve for x
    x = 13,926,043,462.52/128,706.67
  6. Step 6: Final answer
    x = 108,199.86

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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.