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Finding the Fourth Proportional to 304.99, 420.84 and 172.21

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Solution

The fourth proportional to 304.99, 420.84 and 172.21 is: 237.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    304.99 : 420.84 = 172.21 : x
  2. Step 2: Convert to fraction form
    304.99/420.84 = 172.21/x
  3. Step 3: Cross multiply
    304.99x = 420.84 × 172.21
  4. Step 4: Simplify right side
    304.99x = 72,470.75
  5. Step 5: Solve for x
    x = 72,470.75/304.99
  6. Step 6: Final answer
    x = 237.62

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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.