Home / 128,988.72-177,519.60-109,106.46

Finding the Fourth Proportional to 128,988.72, 177,519.60 and 109,106.46

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Solution

The fourth proportional to 128,988.72, 177,519.60 and 109,106.46 is: 150,156.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,988.72 : 177,519.60 = 109,106.46 : x
  2. Step 2: Convert to fraction form
    128,988.72/177,519.60 = 109,106.46/x
  3. Step 3: Cross multiply
    128,988.72x = 177,519.60 × 109,106.46
  4. Step 4: Simplify right side
    128,988.72x = 19,368,535,136.62
  5. Step 5: Solve for x
    x = 19,368,535,136.62/128,988.72
  6. Step 6: Final answer
    x = 150,156.81

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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.