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Finding the Fourth Proportional to 218,812.80, 328,219.20 and 186,007.80

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Solution

The fourth proportional to 218,812.80, 328,219.20 and 186,007.80 is: 279,011.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,812.80 : 328,219.20 = 186,007.80 : x
  2. Step 2: Convert to fraction form
    218,812.80/328,219.20 = 186,007.80/x
  3. Step 3: Cross multiply
    218,812.80x = 328,219.20 × 186,007.80
  4. Step 4: Simplify right side
    218,812.80x = 61,051,331,309.76
  5. Step 5: Solve for x
    x = 61,051,331,309.76/218,812.80
  6. Step 6: Final answer
    x = 279,011.70

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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.