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Finding the Fourth Proportional to 485,864.30, 728,796.45 and 426,815.30

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Solution

The fourth proportional to 485,864.30, 728,796.45 and 426,815.30 is: 640,222.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,864.30 : 728,796.45 = 426,815.30 : x
  2. Step 2: Convert to fraction form
    485,864.30/728,796.45 = 426,815.30/x
  3. Step 3: Cross multiply
    485,864.30x = 728,796.45 × 426,815.30
  4. Step 4: Simplify right side
    485,864.30x = 311,061,475,445.69
  5. Step 5: Solve for x
    x = 311,061,475,445.69/485,864.30
  6. Step 6: Final answer
    x = 640,222.95

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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.