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Finding the Fourth Proportional to 219,781.28, 329,807.28 and 86,638.88

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Solution

The fourth proportional to 219,781.28, 329,807.28 and 86,638.88 is: 130,011.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    219,781.28 : 329,807.28 = 86,638.88 : x
  2. Step 2: Convert to fraction form
    219,781.28/329,807.28 = 86,638.88/x
  3. Step 3: Cross multiply
    219,781.28x = 329,807.28 × 86,638.88
  4. Step 4: Simplify right side
    219,781.28x = 28,574,133,355.05
  5. Step 5: Solve for x
    x = 28,574,133,355.05/219,781.28
  6. Step 6: Final answer
    x = 130,011.68

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.