Home / 128,710.26-177,620.04-72,122.04

Finding the Fourth Proportional to 128,710.26, 177,620.04 and 72,122.04

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Solution

The fourth proportional to 128,710.26, 177,620.04 and 72,122.04 is: 99,528.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,710.26 : 177,620.04 = 72,122.04 : x
  2. Step 2: Convert to fraction form
    128,710.26/177,620.04 = 72,122.04/x
  3. Step 3: Cross multiply
    128,710.26x = 177,620.04 × 72,122.04
  4. Step 4: Simplify right side
    128,710.26x = 12,810,319,629.68
  5. Step 5: Solve for x
    x = 12,810,319,629.68/128,710.26
  6. Step 6: Final answer
    x = 99,528.35

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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.