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Finding the Fourth Proportional to 354.87, 489.87 and 275.99

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Solution

The fourth proportional to 354.87, 489.87 and 275.99 is: 380.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.87 : 489.87 = 275.99 : x
  2. Step 2: Convert to fraction form
    354.87/489.87 = 275.99/x
  3. Step 3: Cross multiply
    354.87x = 489.87 × 275.99
  4. Step 4: Simplify right side
    354.87x = 135,197.84
  5. Step 5: Solve for x
    x = 135,197.84/354.87
  6. Step 6: Final answer
    x = 380.98

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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.