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Finding the Fourth Proportional to 479,191.70, 661,497.09 and 309,508.58

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Solution

The fourth proportional to 479,191.70, 661,497.09 and 309,508.58 is: 427,259.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    479,191.70 : 661,497.09 = 309,508.58 : x
  2. Step 2: Convert to fraction form
    479,191.70/661,497.09 = 309,508.58/x
  3. Step 3: Cross multiply
    479,191.70x = 661,497.09 × 309,508.58
  4. Step 4: Simplify right side
    479,191.70x = 204,739,025,000.03
  5. Step 5: Solve for x
    x = 204,739,025,000.03/479,191.70
  6. Step 6: Final answer
    x = 427,259.12

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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.