Home / 128,514.20-177,225.18-100,209.56

Finding the Fourth Proportional to 128,514.20, 177,225.18 and 100,209.56

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Solution

The fourth proportional to 128,514.20, 177,225.18 and 100,209.56 is: 138,192.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,514.20 : 177,225.18 = 100,209.56 : x
  2. Step 2: Convert to fraction form
    128,514.20/177,225.18 = 100,209.56/x
  3. Step 3: Cross multiply
    128,514.20x = 177,225.18 × 100,209.56
  4. Step 4: Simplify right side
    128,514.20x = 17,759,657,308.72
  5. Step 5: Solve for x
    x = 17,759,657,308.72/128,514.20
  6. Step 6: Final answer
    x = 138,192.18

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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.