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Finding the Fourth Proportional to 355.10, 489.92 and 207.76

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Solution

The fourth proportional to 355.10, 489.92 and 207.76 is: 286.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.10 : 489.92 = 207.76 : x
  2. Step 2: Convert to fraction form
    355.10/489.92 = 207.76/x
  3. Step 3: Cross multiply
    355.10x = 489.92 × 207.76
  4. Step 4: Simplify right side
    355.10x = 101,785.78
  5. Step 5: Solve for x
    x = 101,785.78/355.10
  6. Step 6: Final answer
    x = 286.64

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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.