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Finding the Fourth Proportional to 354.72, 489.20 and 230.25

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Solution

The fourth proportional to 354.72, 489.20 and 230.25 is: 317.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.72 : 489.20 = 230.25 : x
  2. Step 2: Convert to fraction form
    354.72/489.20 = 230.25/x
  3. Step 3: Cross multiply
    354.72x = 489.20 × 230.25
  4. Step 4: Simplify right side
    354.72x = 112,638.30
  5. Step 5: Solve for x
    x = 112,638.30/354.72
  6. Step 6: Final answer
    x = 317.54

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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.