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Finding the Fourth Proportional to 128,919.33, 177,900.47 and 71,559.78

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Solution

The fourth proportional to 128,919.33, 177,900.47 and 71,559.78 is: 98,747.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,919.33 : 177,900.47 = 71,559.78 : x
  2. Step 2: Convert to fraction form
    128,919.33/177,900.47 = 71,559.78/x
  3. Step 3: Cross multiply
    128,919.33x = 177,900.47 × 71,559.78
  4. Step 4: Simplify right side
    128,919.33x = 12,730,518,137.30
  5. Step 5: Solve for x
    x = 12,730,518,137.30/128,919.33
  6. Step 6: Final answer
    x = 98,747.94

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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.