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Finding the Fourth Proportional to 354.78, 489.54 and 207.39

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Solution

The fourth proportional to 354.78, 489.54 and 207.39 is: 286.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.78 : 489.54 = 207.39 : x
  2. Step 2: Convert to fraction form
    354.78/489.54 = 207.39/x
  3. Step 3: Cross multiply
    354.78x = 489.54 × 207.39
  4. Step 4: Simplify right side
    354.78x = 101,525.70
  5. Step 5: Solve for x
    x = 101,525.70/354.78
  6. Step 6: Final answer
    x = 286.17

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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.