Home / 128,720.88-177,646.20-72,144.24

Finding the Fourth Proportional to 128,720.88, 177,646.20 and 72,144.24

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Solution

The fourth proportional to 128,720.88, 177,646.20 and 72,144.24 is: 99,565.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,720.88 : 177,646.20 = 72,144.24 : x
  2. Step 2: Convert to fraction form
    128,720.88/177,646.20 = 72,144.24/x
  3. Step 3: Cross multiply
    128,720.88x = 177,646.20 × 72,144.24
  4. Step 4: Simplify right side
    128,720.88x = 12,816,150,087.89
  5. Step 5: Solve for x
    x = 12,816,150,087.89/128,720.88
  6. Step 6: Final answer
    x = 99,565.43

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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.