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Finding the Fourth Proportional to 128,704.67, 177,612.50 and 78,403.67

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Solution

The fourth proportional to 128,704.67, 177,612.50 and 78,403.67 is: 108,197.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,704.67 : 177,612.50 = 78,403.67 : x
  2. Step 2: Convert to fraction form
    128,704.67/177,612.50 = 78,403.67/x
  3. Step 3: Cross multiply
    128,704.67x = 177,612.50 × 78,403.67
  4. Step 4: Simplify right side
    128,704.67x = 13,925,471,837.88
  5. Step 5: Solve for x
    x = 13,925,471,837.88/128,704.67
  6. Step 6: Final answer
    x = 108,197.10

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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.