Home / 128,382.81-177,176.48-71,794.59

Finding the Fourth Proportional to 128,382.81, 177,176.48 and 71,794.59

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Solution

The fourth proportional to 128,382.81, 177,176.48 and 71,794.59 is: 99,081.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,382.81 : 177,176.48 = 71,794.59 : x
  2. Step 2: Convert to fraction form
    128,382.81/177,176.48 = 71,794.59/x
  3. Step 3: Cross multiply
    128,382.81x = 177,176.48 × 71,794.59
  4. Step 4: Simplify right side
    128,382.81x = 12,720,312,380.27
  5. Step 5: Solve for x
    x = 12,720,312,380.27/128,382.81
  6. Step 6: Final answer
    x = 99,081.12

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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.