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Finding the Fourth Proportional to 211.20, 316.53 and 202.11

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Solution

The fourth proportional to 211.20, 316.53 and 202.11 is: 302.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.20 : 316.53 = 202.11 : x
  2. Step 2: Convert to fraction form
    211.20/316.53 = 202.11/x
  3. Step 3: Cross multiply
    211.20x = 316.53 × 202.11
  4. Step 4: Simplify right side
    211.20x = 63,973.88
  5. Step 5: Solve for x
    x = 63,973.88/211.20
  6. Step 6: Final answer
    x = 302.91

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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.