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Finding the Fourth Proportional to 354.40, 489.28 and 238.08

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Solution

The fourth proportional to 354.40, 489.28 and 238.08 is: 328.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.40 : 489.28 = 238.08 : x
  2. Step 2: Convert to fraction form
    354.40/489.28 = 238.08/x
  3. Step 3: Cross multiply
    354.40x = 489.28 × 238.08
  4. Step 4: Simplify right side
    354.40x = 116,487.78
  5. Step 5: Solve for x
    x = 116,487.78/354.40
  6. Step 6: Final answer
    x = 328.69

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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.