Home / 128,960.01-177,964.91-72,371.38

Finding the Fourth Proportional to 128,960.01, 177,964.91 and 72,371.38

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Solution

The fourth proportional to 128,960.01, 177,964.91 and 72,371.38 is: 99,872.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,960.01 : 177,964.91 = 72,371.38 : x
  2. Step 2: Convert to fraction form
    128,960.01/177,964.91 = 72,371.38/x
  3. Step 3: Cross multiply
    128,960.01x = 177,964.91 × 72,371.38
  4. Step 4: Simplify right side
    128,960.01x = 12,879,566,128.28
  5. Step 5: Solve for x
    x = 12,879,566,128.28/128,960.01
  6. Step 6: Final answer
    x = 99,872.56

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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.