Home / 128,629.63-177,515.22-77,641.55

Finding the Fourth Proportional to 128,629.63, 177,515.22 and 77,641.55

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Solution

The fourth proportional to 128,629.63, 177,515.22 and 77,641.55 is: 107,149.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,629.63 : 177,515.22 = 77,641.55 : x
  2. Step 2: Convert to fraction form
    128,629.63/177,515.22 = 77,641.55/x
  3. Step 3: Cross multiply
    128,629.63x = 177,515.22 × 77,641.55
  4. Step 4: Simplify right side
    128,629.63x = 13,782,556,829.39
  5. Step 5: Solve for x
    x = 13,782,556,829.39/128,629.63
  6. Step 6: Final answer
    x = 107,149.16

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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.