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Finding the Fourth Proportional to 354.95, 489.81 and 199.70

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Solution

The fourth proportional to 354.95, 489.81 and 199.70 is: 275.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.95 : 489.81 = 199.70 : x
  2. Step 2: Convert to fraction form
    354.95/489.81 = 199.70/x
  3. Step 3: Cross multiply
    354.95x = 489.81 × 199.70
  4. Step 4: Simplify right side
    354.95x = 97,812.61
  5. Step 5: Solve for x
    x = 97,812.61/354.95
  6. Step 6: Final answer
    x = 275.57

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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.