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Finding the Fourth Proportional to 284.40, 392.31 and 196.92

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Solution

The fourth proportional to 284.40, 392.31 and 196.92 is: 271.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    284.40 : 392.31 = 196.92 : x
  2. Step 2: Convert to fraction form
    284.40/392.31 = 196.92/x
  3. Step 3: Cross multiply
    284.40x = 392.31 × 196.92
  4. Step 4: Simplify right side
    284.40x = 77,253.69
  5. Step 5: Solve for x
    x = 77,253.69/284.40
  6. Step 6: Final answer
    x = 271.64

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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.