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Finding the Fourth Proportional to 211.84, 316.25 and 199.60

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Solution

The fourth proportional to 211.84, 316.25 and 199.60 is: 297.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.84 : 316.25 = 199.60 : x
  2. Step 2: Convert to fraction form
    211.84/316.25 = 199.60/x
  3. Step 3: Cross multiply
    211.84x = 316.25 × 199.60
  4. Step 4: Simplify right side
    211.84x = 63,123.50
  5. Step 5: Solve for x
    x = 63,123.50/211.84
  6. Step 6: Final answer
    x = 297.98

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.