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Finding the Fourth Proportional to 128,339.78, 177,116.64 and 71,751.56

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Solution

The fourth proportional to 128,339.78, 177,116.64 and 71,751.56 is: 99,021.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,339.78 : 177,116.64 = 71,751.56 : x
  2. Step 2: Convert to fraction form
    128,339.78/177,116.64 = 71,751.56/x
  3. Step 3: Cross multiply
    128,339.78x = 177,116.64 × 71,751.56
  4. Step 4: Simplify right side
    128,339.78x = 12,708,395,221.96
  5. Step 5: Solve for x
    x = 12,708,395,221.96/128,339.78
  6. Step 6: Final answer
    x = 99,021.48

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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.