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Finding the Fourth Proportional to 308,639.86, 425,920.86 and 172,673.26

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Solution

The fourth proportional to 308,639.86, 425,920.86 and 172,673.26 is: 238,287.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    308,639.86 : 425,920.86 = 172,673.26 : x
  2. Step 2: Convert to fraction form
    308,639.86/425,920.86 = 172,673.26/x
  3. Step 3: Cross multiply
    308,639.86x = 425,920.86 × 172,673.26
  4. Step 4: Simplify right side
    308,639.86x = 73,545,143,398.20
  5. Step 5: Solve for x
    x = 73,545,143,398.20/308,639.86
  6. Step 6: Final answer
    x = 238,287.90

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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.