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Finding the Fourth Proportional to 284.56, 392.88 and 206.80

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Solution

The fourth proportional to 284.56, 392.88 and 206.80 is: 285.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    284.56 : 392.88 = 206.80 : x
  2. Step 2: Convert to fraction form
    284.56/392.88 = 206.80/x
  3. Step 3: Cross multiply
    284.56x = 392.88 × 206.80
  4. Step 4: Simplify right side
    284.56x = 81,247.58
  5. Step 5: Solve for x
    x = 81,247.58/284.56
  6. Step 6: Final answer
    x = 285.52

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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.