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Finding the Fourth Proportional to 284.21, 392.20 and 173.80

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Solution

The fourth proportional to 284.21, 392.20 and 173.80 is: 239.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    284.21 : 392.20 = 173.80 : x
  2. Step 2: Convert to fraction form
    284.21/392.20 = 173.80/x
  3. Step 3: Cross multiply
    284.21x = 392.20 × 173.80
  4. Step 4: Simplify right side
    284.21x = 68,164.36
  5. Step 5: Solve for x
    x = 68,164.36/284.21
  6. Step 6: Final answer
    x = 239.84

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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.