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Finding the Fourth Proportional to 354.72, 489.58 and 207.39

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Solution

The fourth proportional to 354.72, 489.58 and 207.39 is: 286.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.72 : 489.58 = 207.39 : x
  2. Step 2: Convert to fraction form
    354.72/489.58 = 207.39/x
  3. Step 3: Cross multiply
    354.72x = 489.58 × 207.39
  4. Step 4: Simplify right side
    354.72x = 101,532.06
  5. Step 5: Solve for x
    x = 101,532.06/354.72
  6. Step 6: Final answer
    x = 286.23

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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.