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Finding the Fourth Proportional to 485,861.68, 670,460.25 and 281,896.80

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Solution

The fourth proportional to 485,861.68, 670,460.25 and 281,896.80 is: 389,000.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,861.68 : 670,460.25 = 281,896.80 : x
  2. Step 2: Convert to fraction form
    485,861.68/670,460.25 = 281,896.80/x
  3. Step 3: Cross multiply
    485,861.68x = 670,460.25 × 281,896.80
  4. Step 4: Simplify right side
    485,861.68x = 189,000,599,002.20
  5. Step 5: Solve for x
    x = 189,000,599,002.20/485,861.68
  6. Step 6: Final answer
    x = 389,000.83

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.