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Finding the Fourth Proportional to 479,426.80, 719,399.40 and 213,228.40

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Solution

The fourth proportional to 479,426.80, 719,399.40 and 213,228.40 is: 319,957.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    479,426.80 : 719,399.40 = 213,228.40 : x
  2. Step 2: Convert to fraction form
    479,426.80/719,399.40 = 213,228.40/x
  3. Step 3: Cross multiply
    479,426.80x = 719,399.40 × 213,228.40
  4. Step 4: Simplify right side
    479,426.80x = 153,396,383,022.96
  5. Step 5: Solve for x
    x = 153,396,383,022.96/479,426.80
  6. Step 6: Final answer
    x = 319,957.88

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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.