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Finding the Fourth Proportional to 128,661.11, 177,531.65 and 80,880.63

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Solution

The fourth proportional to 128,661.11, 177,531.65 and 80,880.63 is: 111,602.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,661.11 : 177,531.65 = 80,880.63 : x
  2. Step 2: Convert to fraction form
    128,661.11/177,531.65 = 80,880.63/x
  3. Step 3: Cross multiply
    128,661.11x = 177,531.65 × 80,880.63
  4. Step 4: Simplify right side
    128,661.11x = 14,358,871,696.94
  5. Step 5: Solve for x
    x = 14,358,871,696.94/128,661.11
  6. Step 6: Final answer
    x = 111,602.27

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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.