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Finding the Fourth Proportional to 128,382.66, 177,140.25 and 71,792.10

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Solution

The fourth proportional to 128,382.66, 177,140.25 and 71,792.10 is: 99,057.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,382.66 : 177,140.25 = 71,792.10 : x
  2. Step 2: Convert to fraction form
    128,382.66/177,140.25 = 71,792.10/x
  3. Step 3: Cross multiply
    128,382.66x = 177,140.25 × 71,792.10
  4. Step 4: Simplify right side
    128,382.66x = 12,717,270,542.03
  5. Step 5: Solve for x
    x = 12,717,270,542.03/128,382.66
  6. Step 6: Final answer
    x = 99,057.54

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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.