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Finding the Fourth Proportional to 354.55, 489.30 and 207.19

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Solution

The fourth proportional to 354.55, 489.30 and 207.19 is: 285.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.55 : 489.30 = 207.19 : x
  2. Step 2: Convert to fraction form
    354.55/489.30 = 207.19/x
  3. Step 3: Cross multiply
    354.55x = 489.30 × 207.19
  4. Step 4: Simplify right side
    354.55x = 101,378.07
  5. Step 5: Solve for x
    x = 101,378.07/354.55
  6. Step 6: Final answer
    x = 285.93

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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.