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Finding the Fourth Proportional to 263,420.80, 393,964.80 and 221,430.40

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Solution

The fourth proportional to 263,420.80, 393,964.80 and 221,430.40 is: 331,165.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    263,420.80 : 393,964.80 = 221,430.40 : x
  2. Step 2: Convert to fraction form
    263,420.80/393,964.80 = 221,430.40/x
  3. Step 3: Cross multiply
    263,420.80x = 393,964.80 × 221,430.40
  4. Step 4: Simplify right side
    263,420.80x = 87,235,783,249.92
  5. Step 5: Solve for x
    x = 87,235,783,249.92/263,420.80
  6. Step 6: Final answer
    x = 331,165.13

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.