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Finding the Fourth Proportional to 355.40, 489.88 and 267.92

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Solution

The fourth proportional to 355.40, 489.88 and 267.92 is: 369.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.40 : 489.88 = 267.92 : x
  2. Step 2: Convert to fraction form
    355.40/489.88 = 267.92/x
  3. Step 3: Cross multiply
    355.40x = 489.88 × 267.92
  4. Step 4: Simplify right side
    355.40x = 131,248.65
  5. Step 5: Solve for x
    x = 131,248.65/355.40
  6. Step 6: Final answer
    x = 369.30

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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.