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Finding the Fourth Proportional to 308,913.69, 426,341.10 and 172,999.54

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Solution

The fourth proportional to 308,913.69, 426,341.10 and 172,999.54 is: 238,761.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    308,913.69 : 426,341.10 = 172,999.54 : x
  2. Step 2: Convert to fraction form
    308,913.69/426,341.10 = 172,999.54/x
  3. Step 3: Cross multiply
    308,913.69x = 426,341.10 × 172,999.54
  4. Step 4: Simplify right side
    308,913.69x = 73,756,814,183.09
  5. Step 5: Solve for x
    x = 73,756,814,183.09/308,913.69
  6. Step 6: Final answer
    x = 238,761.88

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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.