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Finding the Fourth Proportional to 284.47, 392.41 and 196.99

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Solution

The fourth proportional to 284.47, 392.41 and 196.99 is: 271.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    284.47 : 392.41 = 196.99 : x
  2. Step 2: Convert to fraction form
    284.47/392.41 = 196.99/x
  3. Step 3: Cross multiply
    284.47x = 392.41 × 196.99
  4. Step 4: Simplify right side
    284.47x = 77,300.85
  5. Step 5: Solve for x
    x = 77,300.85/284.47
  6. Step 6: Final answer
    x = 271.74

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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.