Home / 128,695.20-177,599.40-72,107.04

Finding the Fourth Proportional to 128,695.20, 177,599.40 and 72,107.04

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Solution

The fourth proportional to 128,695.20, 177,599.40 and 72,107.04 is: 99,507.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,695.20 : 177,599.40 = 72,107.04 : x
  2. Step 2: Convert to fraction form
    128,695.20/177,599.40 = 72,107.04/x
  3. Step 3: Cross multiply
    128,695.20x = 177,599.40 × 72,107.04
  4. Step 4: Simplify right side
    128,695.20x = 12,806,167,039.78
  5. Step 5: Solve for x
    x = 12,806,167,039.78/128,695.20
  6. Step 6: Final answer
    x = 99,507.73

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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.