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Finding the Fourth Proportional to 272.98, 409.49 and 99.64

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Solution

The fourth proportional to 272.98, 409.49 and 99.64 is: 149.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    272.98 : 409.49 = 99.64 : x
  2. Step 2: Convert to fraction form
    272.98/409.49 = 99.64/x
  3. Step 3: Cross multiply
    272.98x = 409.49 × 99.64
  4. Step 4: Simplify right side
    272.98x = 40,801.58
  5. Step 5: Solve for x
    x = 40,801.58/272.98
  6. Step 6: Final answer
    x = 149.47

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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.