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Finding the Fourth Proportional to 393,702.53, 543,319.75 and 221,626.78

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Solution

The fourth proportional to 393,702.53, 543,319.75 and 221,626.78 is: 305,850.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,702.53 : 543,319.75 = 221,626.78 : x
  2. Step 2: Convert to fraction form
    393,702.53/543,319.75 = 221,626.78/x
  3. Step 3: Cross multiply
    393,702.53x = 543,319.75 × 221,626.78
  4. Step 4: Simplify right side
    393,702.53x = 120,414,208,677.81
  5. Step 5: Solve for x
    x = 120,414,208,677.81/393,702.53
  6. Step 6: Final answer
    x = 305,850.74

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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.