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Finding the Fourth Proportional to 393,946.72, 543,586.47 and 221,855.63

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Solution

The fourth proportional to 393,946.72, 543,586.47 and 221,855.63 is: 306,126.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,946.72 : 543,586.47 = 221,855.63 : x
  2. Step 2: Convert to fraction form
    393,946.72/543,586.47 = 221,855.63/x
  3. Step 3: Cross multiply
    393,946.72x = 543,586.47 × 221,855.63
  4. Step 4: Simplify right side
    393,946.72x = 120,597,718,761.33
  5. Step 5: Solve for x
    x = 120,597,718,761.33/393,946.72
  6. Step 6: Final answer
    x = 306,126.98

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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.