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Finding the Fourth Proportional to 485,855.40, 728,610.30 and 219,743.40

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Solution

The fourth proportional to 485,855.40, 728,610.30 and 219,743.40 is: 329,536.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,855.40 : 728,610.30 = 219,743.40 : x
  2. Step 2: Convert to fraction form
    485,855.40/728,610.30 = 219,743.40/x
  3. Step 3: Cross multiply
    485,855.40x = 728,610.30 × 219,743.40
  4. Step 4: Simplify right side
    485,855.40x = 160,107,304,597.02
  5. Step 5: Solve for x
    x = 160,107,304,597.02/485,855.40
  6. Step 6: Final answer
    x = 329,536.95

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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.