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Finding the Fourth Proportional to 308,321.43, 425,485.91 and 172,360.90

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Solution

The fourth proportional to 308,321.43, 425,485.91 and 172,360.90 is: 237,859.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    308,321.43 : 425,485.91 = 172,360.90 : x
  2. Step 2: Convert to fraction form
    308,321.43/425,485.91 = 172,360.90/x
  3. Step 3: Cross multiply
    308,321.43x = 425,485.91 × 172,360.90
  4. Step 4: Simplify right side
    308,321.43x = 73,337,134,384.92
  5. Step 5: Solve for x
    x = 73,337,134,384.92/308,321.43
  6. Step 6: Final answer
    x = 237,859.35

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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.