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Finding the Fourth Proportional to 128,382.05, 177,167.57 and 71,793.42

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Solution

The fourth proportional to 128,382.05, 177,167.57 and 71,793.42 is: 99,075.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,382.05 : 177,167.57 = 71,793.42 : x
  2. Step 2: Convert to fraction form
    128,382.05/177,167.57 = 71,793.42/x
  3. Step 3: Cross multiply
    128,382.05x = 177,167.57 × 71,793.42
  4. Step 4: Simplify right side
    128,382.05x = 12,719,465,404.42
  5. Step 5: Solve for x
    x = 12,719,465,404.42/128,382.05
  6. Step 6: Final answer
    x = 99,075.11

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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.