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Finding the Fourth Proportional to 642,728.20, 965,129.10 and 485,134.60

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Solution

The fourth proportional to 642,728.20, 965,129.10 and 485,134.60 is: 728,484.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,728.20 : 965,129.10 = 485,134.60 : x
  2. Step 2: Convert to fraction form
    642,728.20/965,129.10 = 485,134.60/x
  3. Step 3: Cross multiply
    642,728.20x = 965,129.10 × 485,134.60
  4. Step 4: Simplify right side
    642,728.20x = 468,217,519,876.86
  5. Step 5: Solve for x
    x = 468,217,519,876.86/642,728.20
  6. Step 6: Final answer
    x = 728,484.48

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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.