Home / 128,899.69-177,882.21-72,311.06

Finding the Fourth Proportional to 128,899.69, 177,882.21 and 72,311.06

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Solution

The fourth proportional to 128,899.69, 177,882.21 and 72,311.06 is: 99,789.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,899.69 : 177,882.21 = 72,311.06 : x
  2. Step 2: Convert to fraction form
    128,899.69/177,882.21 = 72,311.06/x
  3. Step 3: Cross multiply
    128,899.69x = 177,882.21 × 72,311.06
  4. Step 4: Simplify right side
    128,899.69x = 12,862,851,604.95
  5. Step 5: Solve for x
    x = 12,862,851,604.95/128,899.69
  6. Step 6: Final answer
    x = 99,789.63

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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.