Home / 128,372.23-177,161.85-71,783.59

Finding the Fourth Proportional to 128,372.23, 177,161.85 and 71,783.59

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Solution

The fourth proportional to 128,372.23, 177,161.85 and 71,783.59 is: 99,065.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,372.23 : 177,161.85 = 71,783.59 : x
  2. Step 2: Convert to fraction form
    128,372.23/177,161.85 = 71,783.59/x
  3. Step 3: Cross multiply
    128,372.23x = 177,161.85 × 71,783.59
  4. Step 4: Simplify right side
    128,372.23x = 12,717,313,604.04
  5. Step 5: Solve for x
    x = 12,717,313,604.04/128,372.23
  6. Step 6: Final answer
    x = 99,065.92

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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.