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Finding the Fourth Proportional to 393,605.20, 543,130.32 and 221,489.92

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Solution

The fourth proportional to 393,605.20, 543,130.32 and 221,489.92 is: 305,630.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,605.20 : 543,130.32 = 221,489.92 : x
  2. Step 2: Convert to fraction form
    393,605.20/543,130.32 = 221,489.92/x
  3. Step 3: Cross multiply
    393,605.20x = 543,130.32 × 221,489.92
  4. Step 4: Simplify right side
    393,605.20x = 120,297,891,126.37
  5. Step 5: Solve for x
    x = 120,297,891,126.37/393,605.20
  6. Step 6: Final answer
    x = 305,630.85

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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.