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Finding the Fourth Proportional to 393,713.72, 543,342.60 and 221,690.84

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Solution

The fourth proportional to 393,713.72, 543,342.60 and 221,690.84 is: 305,943.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,713.72 : 543,342.60 = 221,690.84 : x
  2. Step 2: Convert to fraction form
    393,713.72/543,342.60 = 221,690.84/x
  3. Step 3: Cross multiply
    393,713.72x = 543,342.60 × 221,690.84
  4. Step 4: Simplify right side
    393,713.72x = 120,454,077,401.78
  5. Step 5: Solve for x
    x = 120,454,077,401.78/393,713.72
  6. Step 6: Final answer
    x = 305,943.31

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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.