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Finding the Fourth Proportional to 393,683.75, 543,300.80 and 221,612.84

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Solution

The fourth proportional to 393,683.75, 543,300.80 and 221,612.84 is: 305,835.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,683.75 : 543,300.80 = 221,612.84 : x
  2. Step 2: Convert to fraction form
    393,683.75/543,300.80 = 221,612.84/x
  3. Step 3: Cross multiply
    393,683.75x = 543,300.80 × 221,612.84
  4. Step 4: Simplify right side
    393,683.75x = 120,402,429,437.70
  5. Step 5: Solve for x
    x = 120,402,429,437.70/393,683.75
  6. Step 6: Final answer
    x = 305,835.41

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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.