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Finding the Fourth Proportional to 354.86, 489.80 and 207.58

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Solution

The fourth proportional to 354.86, 489.80 and 207.58 is: 286.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.86 : 489.80 = 207.58 : x
  2. Step 2: Convert to fraction form
    354.86/489.80 = 207.58/x
  3. Step 3: Cross multiply
    354.86x = 489.80 × 207.58
  4. Step 4: Simplify right side
    354.86x = 101,672.68
  5. Step 5: Solve for x
    x = 101,672.68/354.86
  6. Step 6: Final answer
    x = 286.51

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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.