Home / 128,943.72-177,939.45-71,579.70

Finding the Fourth Proportional to 128,943.72, 177,939.45 and 71,579.70

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Solution

The fourth proportional to 128,943.72, 177,939.45 and 71,579.70 is: 98,778.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,943.72 : 177,939.45 = 71,579.70 : x
  2. Step 2: Convert to fraction form
    128,943.72/177,939.45 = 71,579.70/x
  3. Step 3: Cross multiply
    128,943.72x = 177,939.45 × 71,579.70
  4. Step 4: Simplify right side
    128,943.72x = 12,736,852,449.17
  5. Step 5: Solve for x
    x = 12,736,852,449.17/128,943.72
  6. Step 6: Final answer
    x = 98,778.39

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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.