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Finding the Fourth Proportional to 211.23, 318.76 and 203.99

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Solution

The fourth proportional to 211.23, 318.76 and 203.99 is: 307.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.23 : 318.76 = 203.99 : x
  2. Step 2: Convert to fraction form
    211.23/318.76 = 203.99/x
  3. Step 3: Cross multiply
    211.23x = 318.76 × 203.99
  4. Step 4: Simplify right side
    211.23x = 65,021.75
  5. Step 5: Solve for x
    x = 65,021.75/211.23
  6. Step 6: Final answer
    x = 307.82

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.