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Finding the Fourth Proportional to 354.90, 489.76 and 207.54

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Solution

The fourth proportional to 354.90, 489.76 and 207.54 is: 286.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.90 : 489.76 = 207.54 : x
  2. Step 2: Convert to fraction form
    354.90/489.76 = 207.54/x
  3. Step 3: Cross multiply
    354.90x = 489.76 × 207.54
  4. Step 4: Simplify right side
    354.90x = 101,644.79
  5. Step 5: Solve for x
    x = 101,644.79/354.90
  6. Step 6: Final answer
    x = 286.40

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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.