Home / 128,561.13-177,393.24-80,780.64

Finding the Fourth Proportional to 128,561.13, 177,393.24 and 80,780.64

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Solution

The fourth proportional to 128,561.13, 177,393.24 and 80,780.64 is: 111,464.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,561.13 : 177,393.24 = 80,780.64 : x
  2. Step 2: Convert to fraction form
    128,561.13/177,393.24 = 80,780.64/x
  3. Step 3: Cross multiply
    128,561.13x = 177,393.24 × 80,780.64
  4. Step 4: Simplify right side
    128,561.13x = 14,329,939,458.87
  5. Step 5: Solve for x
    x = 14,329,939,458.87/128,561.13
  6. Step 6: Final answer
    x = 111,464.01

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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.