Home / 128,478.05-177,308.75-71,119.87

Finding the Fourth Proportional to 128,478.05, 177,308.75 and 71,119.87

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Solution

The fourth proportional to 128,478.05, 177,308.75 and 71,119.87 is: 98,150.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,478.05 : 177,308.75 = 71,119.87 : x
  2. Step 2: Convert to fraction form
    128,478.05/177,308.75 = 71,119.87/x
  3. Step 3: Cross multiply
    128,478.05x = 177,308.75 × 71,119.87
  4. Step 4: Simplify right side
    128,478.05x = 12,610,175,581.70
  5. Step 5: Solve for x
    x = 12,610,175,581.70/128,478.05
  6. Step 6: Final answer
    x = 98,150.43

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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.