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Finding the Fourth Proportional to 354.71, 489.45 and 203.28

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Solution

The fourth proportional to 354.71, 489.45 and 203.28 is: 280.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.71 : 489.45 = 203.28 : x
  2. Step 2: Convert to fraction form
    354.71/489.45 = 203.28/x
  3. Step 3: Cross multiply
    354.71x = 489.45 × 203.28
  4. Step 4: Simplify right side
    354.71x = 99,495.40
  5. Step 5: Solve for x
    x = 99,495.40/354.71
  6. Step 6: Final answer
    x = 280.50

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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.