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Finding the Fourth Proportional to 489.18, 675.20 and 302.56

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Solution

The fourth proportional to 489.18, 675.20 and 302.56 is: 417.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.18 : 675.20 = 302.56 : x
  2. Step 2: Convert to fraction form
    489.18/675.20 = 302.56/x
  3. Step 3: Cross multiply
    489.18x = 675.20 × 302.56
  4. Step 4: Simplify right side
    489.18x = 204,288.02
  5. Step 5: Solve for x
    x = 204,288.02/489.18
  6. Step 6: Final answer
    x = 417.61

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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.