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Finding the Fourth Proportional to 312,401.28, 431,156.16 and 191,614.08

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Solution

The fourth proportional to 312,401.28, 431,156.16 and 191,614.08 is: 264,453.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    312,401.28 : 431,156.16 = 191,614.08 : x
  2. Step 2: Convert to fraction form
    312,401.28/431,156.16 = 191,614.08/x
  3. Step 3: Cross multiply
    312,401.28x = 431,156.16 × 191,614.08
  4. Step 4: Simplify right side
    312,401.28x = 82,615,590,934.73
  5. Step 5: Solve for x
    x = 82,615,590,934.73/312,401.28
  6. Step 6: Final answer
    x = 264,453.43

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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.