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Finding the Fourth Proportional to 355.17, 489.64 and 344.40

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Solution

The fourth proportional to 355.17, 489.64 and 344.40 is: 474.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.17 : 489.64 = 344.40 : x
  2. Step 2: Convert to fraction form
    355.17/489.64 = 344.40/x
  3. Step 3: Cross multiply
    355.17x = 489.64 × 344.40
  4. Step 4: Simplify right side
    355.17x = 168,632.02
  5. Step 5: Solve for x
    x = 168,632.02/355.17
  6. Step 6: Final answer
    x = 474.79

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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.