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Finding the Fourth Proportional to 317,931.20, 438,783.20 and 190,676.80

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Solution

The fourth proportional to 317,931.20, 438,783.20 and 190,676.80 is: 263,156.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    317,931.20 : 438,783.20 = 190,676.80 : x
  2. Step 2: Convert to fraction form
    317,931.20/438,783.20 = 190,676.80/x
  3. Step 3: Cross multiply
    317,931.20x = 438,783.20 × 190,676.80
  4. Step 4: Simplify right side
    317,931.20x = 83,665,776,469.76
  5. Step 5: Solve for x
    x = 83,665,776,469.76/317,931.20
  6. Step 6: Final answer
    x = 263,156.86

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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.