Home / 128,515.20-177,226.56-100,210.56

Finding the Fourth Proportional to 128,515.20, 177,226.56 and 100,210.56

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Solution

The fourth proportional to 128,515.20, 177,226.56 and 100,210.56 is: 138,193.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,515.20 : 177,226.56 = 100,210.56 : x
  2. Step 2: Convert to fraction form
    128,515.20/177,226.56 = 100,210.56/x
  3. Step 3: Cross multiply
    128,515.20x = 177,226.56 × 100,210.56
  4. Step 4: Simplify right side
    128,515.20x = 17,759,972,824.47
  5. Step 5: Solve for x
    x = 17,759,972,824.47/128,515.20
  6. Step 6: Final answer
    x = 138,193.56

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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.