Home / 128,489.20-177,320.04-71,899.36

Finding the Fourth Proportional to 128,489.20, 177,320.04 and 71,899.36

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Solution

The fourth proportional to 128,489.20, 177,320.04 and 71,899.36 is: 99,223.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,489.20 : 177,320.04 = 71,899.36 : x
  2. Step 2: Convert to fraction form
    128,489.20/177,320.04 = 71,899.36/x
  3. Step 3: Cross multiply
    128,489.20x = 177,320.04 × 71,899.36
  4. Step 4: Simplify right side
    128,489.20x = 12,749,197,391.17
  5. Step 5: Solve for x
    x = 12,749,197,391.17/128,489.20
  6. Step 6: Final answer
    x = 99,223.88

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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.