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Finding the Fourth Proportional to 304.91, 420.72 and 173.92

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Solution

The fourth proportional to 304.91, 420.72 and 173.92 is: 239.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    304.91 : 420.72 = 173.92 : x
  2. Step 2: Convert to fraction form
    304.91/420.72 = 173.92/x
  3. Step 3: Cross multiply
    304.91x = 420.72 × 173.92
  4. Step 4: Simplify right side
    304.91x = 73,173.11
  5. Step 5: Solve for x
    x = 73,173.11/304.91
  6. Step 6: Final answer
    x = 239.98

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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.