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Finding the Fourth Proportional to 128,556.59, 177,408.10 and 78,255.59

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Solution

The fourth proportional to 128,556.59, 177,408.10 and 78,255.59 is: 107,992.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,556.59 : 177,408.10 = 78,255.59 : x
  2. Step 2: Convert to fraction form
    128,556.59/177,408.10 = 78,255.59/x
  3. Step 3: Cross multiply
    128,556.59x = 177,408.10 × 78,255.59
  4. Step 4: Simplify right side
    128,556.59x = 13,883,175,536.28
  5. Step 5: Solve for x
    x = 13,883,175,536.28/128,556.59
  6. Step 6: Final answer
    x = 107,992.72

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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.