Home / 128,278.56-177,028.08-71,690.04

Finding the Fourth Proportional to 128,278.56, 177,028.08 and 71,690.04

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Solution

The fourth proportional to 128,278.56, 177,028.08 and 71,690.04 is: 98,934.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,278.56 : 177,028.08 = 71,690.04 : x
  2. Step 2: Convert to fraction form
    128,278.56/177,028.08 = 71,690.04/x
  3. Step 3: Cross multiply
    128,278.56x = 177,028.08 × 71,690.04
  4. Step 4: Simplify right side
    128,278.56x = 12,691,150,136.32
  5. Step 5: Solve for x
    x = 12,691,150,136.32/128,278.56
  6. Step 6: Final answer
    x = 98,934.30

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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.