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Finding the Fourth Proportional to 354.60, 489.85 and 284.57

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Solution

The fourth proportional to 354.60, 489.85 and 284.57 is: 393.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.60 : 489.85 = 284.57 : x
  2. Step 2: Convert to fraction form
    354.60/489.85 = 284.57/x
  3. Step 3: Cross multiply
    354.60x = 489.85 × 284.57
  4. Step 4: Simplify right side
    354.60x = 139,396.61
  5. Step 5: Solve for x
    x = 139,396.61/354.60
  6. Step 6: Final answer
    x = 393.11

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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.