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Finding the Fourth Proportional to 128,636.88, 177,446.56 and 90,845.52

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Solution

The fourth proportional to 128,636.88, 177,446.56 and 90,845.52 is: 125,315.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,636.88 : 177,446.56 = 90,845.52 : x
  2. Step 2: Convert to fraction form
    128,636.88/177,446.56 = 90,845.52/x
  3. Step 3: Cross multiply
    128,636.88x = 177,446.56 × 90,845.52
  4. Step 4: Simplify right side
    128,636.88x = 16,120,225,015.41
  5. Step 5: Solve for x
    x = 16,120,225,015.41/128,636.88
  6. Step 6: Final answer
    x = 125,315.73

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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.