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Finding the Fourth Proportional to 390.84, 586.41 and 281.43

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Solution

The fourth proportional to 390.84, 586.41 and 281.43 is: 422.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.84 : 586.41 = 281.43 : x
  2. Step 2: Convert to fraction form
    390.84/586.41 = 281.43/x
  3. Step 3: Cross multiply
    390.84x = 586.41 × 281.43
  4. Step 4: Simplify right side
    390.84x = 165,033.37
  5. Step 5: Solve for x
    x = 165,033.37/390.84
  6. Step 6: Final answer
    x = 422.25

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.