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Finding the Fourth Proportional to 128,709.36, 177,618.68 and 78,408.36

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Solution

The fourth proportional to 128,709.36, 177,618.68 and 78,408.36 is: 108,203.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,709.36 : 177,618.68 = 78,408.36 : x
  2. Step 2: Convert to fraction form
    128,709.36/177,618.68 = 78,408.36/x
  3. Step 3: Cross multiply
    128,709.36x = 177,618.68 × 78,408.36
  4. Step 4: Simplify right side
    128,709.36x = 13,926,789,404.16
  5. Step 5: Solve for x
    x = 13,926,789,404.16/128,709.36
  6. Step 6: Final answer
    x = 108,203.39

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1.5x scale

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.